目录
初始化脚手架
说明
具体步骤
模板项目的结构
关于不同版本的Vue
vue.config.js配置文件
ref属性
配置项props
mixin（混入）
插件
scoped样式
总结TodoList案例
webStorage（浏览器本地存储）
TodoList本地存储
组件的自定义事件
全局事件总线（GlobalEventBus）
TodoList事件总线
消息订阅与发布（pubsub）
TodoList_pubsub
nextTick
Vue封装的过渡与动画
TodoList_动画
初始化脚手架
说明
Vue脚手架是Vue官方提供的标准化开发工具（开发平台）
文档：https://cli.vuejs.org/zh/
具体步骤
1.全局安装@vue/cli
npm install -g @vue/cli2.切换到要创建项目的目录，然后使用命令创建项目
vue create xxxx3.启动项目
npm run serve备注：
Vue脚手架隐藏了所有webpack相关的配置，若想查看具体的webpack配置，执行：
vue inspect > output.js模板项目的结构
分析脚手架：
main.js：
/**
* 该文件是整个项目的入口文件
*/
//引入Vue
import Vue from 'vue'
//引入App组件，它是所有组件的父组件
import App from './App.vue'
//关闭Vue的生产提示
Vue.config.productionTip = false
//创建Vue实例对象vm
new Vue({
el:'#app',
//将App组件放入容器中
render: h => h(App),
})
App.vue：
<template>
<div>
<img src="./assets/logo.png" alt="logo">
<MySchool></MySchool>
<MyStudent></MyStudent>
</div>
</template>
<script>
//引入组件
import MySchool from './components/MySchool';
import MyStudent from './components/MyStudent';
export default {
name:'App',
components:{
MySchool,
MyStudent
}
}
</script>
<style>
</style>
MySchool.vue：
<template>
<!-- 组件的结构 -->
<div class="demo">
<h2>学校名称：{{SchoolName}}</h2>
<h2>学校地址：{{address}}</h2>
<button @click="showName">点我提示学校名</button>
</div>
</template>
<script>
//组件交互相关的代码（数据、方法等等）
export default{
name:'MySchool',
data(){
return{
SchoolName:'尚硅谷1',
address:'北京'
}
},
methods: {
showName(){
alert(this.SchoolName)
}
}
}
</script>
<style>
/* 组件的样式 */
.demo{
background-color: orange;
}
</style>
MyStudent.vue：
<template>
<!-- 组件的结构 -->
<div>
<h2>学生姓名：{{StudentName}}</h2>
<h2>学校年龄：{{age}}</h2>
</div>
</template>
<script>
//组件交互相关的代码（数据、方法等等）
export default{
name:'MyStudent',
data(){
return{
StudentName:'张三',
age:18
}
}
}
</script>
关于不同版本的Vue
vue.js与vue.runtime.xxx.js的区别：
(1)vue.js是完整版的Vue，包含：核心功能+模板解析器
(2)vue.runtime.xxx.js是运行版的Vue，只包含：核心功能，没有模板解析器
因为vue.runtime.xxx.js没有模板解析器，所以不能使用template配置项，需要使用render函数接收
到的createElement函数去指定具体内容
vue.config.js配置文件
使用vue inspect > output.js可以查看到Vue脚手架的默认配置
使用vue.config.js可以对脚手架进行个性化定制，详情见：https://cli.vuejs.org/zh
ref属性
- 被用来给元素或子组件注册引用信息（id的替代者）
- 应用在html标签上获取的是真实DOM元素，应用在组件标签上是组件实例对象（vc）
- 使用方式：
打标识：<h1 ref="xxx">......</h1>或<School ref="xxx"></School>
获取：this.$refs.xxx
main.js：
//引入Vue
import Vue from "vue";
//引入App
import App from "./App.vue";
Vue.config.productionTip = false
//创建vm
new Vue({
el:'#app',
render: h => h(App)
})App.vue：
<template>
<div>
<h1 v-text="msg" ref="title"></h1>
<button ref="btn" @click="showDOM">点我输出上方的DOM元素</button>
<School ref="sch"/>
</div>
</template>
<script>
//引入School组件
import School from './components/School'
export default {
name:'App',
components:{
School
},
data() {
return {
msg:'欢迎学习Vue'
}
},
methods:{
showDOM(){
console.log(this.$refs.title) //真实DOM元素
console.log(this.$refs.btn) //真实DOM元素
console.log(this.$refs.sch) //School组件的实例对象（vc）
}
}
}
</script>
School.vue：
<template>
<div class="school">
<h2>学校名称：{{name}}</h2>
<h2>学校地址：{{address}}</h2>
</div>
</template>
<script>
export default {
name:'School',
data(){
return{
name:'尚硅谷1',
address:'北京'
}
}
}
</script>
<style>
.school{
background-color: gray;
}
</style>配置项props
功能：让组件接收外部传过来的数据
1.传递数据：
<Demo name="xxx"/>2.接收数据：
(1)第一种方式（只接收）：
props:['name'](2)第二种方式（限制类型）：
props:{
name:String
}(3)第三种方式（限制类型、限制必要性、指定默认值）：
props:{
name:{
type:String, //类型
required:true, //必要性
default:'张三' //默认值
}
}备注：props是只读的，Vue底层会监测你对props的修改，如果进行了修改，就会发出警告，若业
务需求确实需要修改，那么请复制props的内容到data中一份，然后去修改data中的数据
main.js：
//引入Vue
import Vue from "vue";
//引入App
import App from "./App.vue";
Vue.config.productionTip = false
//创建vm
new Vue({
el:'#app',
render: h => h(App)
})App.vue：
<template>
<div>
<Student name="李四" sex="女" :age="18"/>
</div>
</template>
<script>
//引入Student组件
import Student from './components/Student.vue';
export default {
name:'App',
components:{
Student
}
}
</script>
Student.vue：
<template>
<div>
<h1>{{msg}}</h1>
<h2>学生姓名：{{name}}</h2>
<h2>学生性别：{{sex}}</h2>
<h2>学生年龄:{{myAge+1}}</h2>
<button @click="updateAge">尝试修改收到的年龄</button>
</div>
</template>
<script>
export default {
name:'Student',
data(){
return{
msg:'我是一个尚硅谷的学生',
myAge:this.age
}
},
methods:{
updateAge(){
this.myAge++
}
},
//简单声明接收
props:['name','sex','age']
//接收的同时对数据进行类型限制
/* props:{
name:String,
age:Number,
sex:String
} */
//接收的同时对数据进行类型限制+默认值的指定+必要性的限制
/* props:{
name:{
type:String, //name的类型
required:true //name是必要的
},
age:{
type:Number,
default:99 //默认值
},
sex:{
type:String,
required:true
}
} */
}
</script>
mixin（混入）
功能：可以把多个组件共用的配置提取成一个混入对象
使用方式：
- 第一步：定义混入
{
data(){
},
methods:{
}
......
}- 第二步：使用混入
(1)全局混入：Vue.mixin(xxx)
(2)局部混入：mixins:['xxx']
mixin.js：
export const hunhe = {
methods:{
showName(){
alert(this.name)
}
},
mounted() {
console.log('你好')
}
}
export const hunhe2 = {
data() {
return {
x:100,
y:200
}
}
}main.js：
//引入Vue
import Vue from "vue";
//引入App
import App from "./App.vue";
//引入混入
import { hunhe,hunhe2 } from "./mixin";
Vue.config.productionTip = false
Vue.mixin(hunhe)
Vue.mixin(hunhe2)
//创建vm
new Vue({
el:'#app',
render: h => h(App)
})App.vue：
<template>
<div>
<School/>
<hr>
<Student/>
</div>
</template>
<script>
//引入School组件
import School from './components/School.vue';
import Student from './components/Student.vue';
export default {
name:'App',
components:{
School,
Student
}
}
</script>
School.vue：
<template>
<div>
<h2 @click="showName">学校名称：{{name}}</h2>
<h2>学校地址：{{address}}</h2>
</div>
</template>
<script>
// import { hunhe,hunhe2 } from '@/mixin';
export default {
name:'School',
data(){
return{
name:'尚硅谷',
address:'北京'
}
},
// mixins:[hunhe,hunhe2],
mounted(){
console.log('你好！！！')
}
}
</script>
Student.vue：
<template>
<div>
<h2 @click="showName">学生姓名：{{name}}</h2>
<h2>学生性别：{{sex}}</h2>
</div>
</template>
<script>
// import { hunhe } from '@/mixin';
export default {
name:'Student',
data(){
return{
name:'张三',
sex:'男'
}
},
// mixins:[hunhe]
}
</script>
插件
功能：用于增强Vue
本质：包含install方法的一个对象，install的第一个参数是Vue，第二个以后的参数是插件使用者传
递的数据
定义插件：
对象.install = function(Vue,options){
//1.添加全局过滤器
Vue.filter(...)
//2.添加全局指令
Vue.directive(...)
//3.配置全局混入
Vue.mixin(...)
//4.添加实例方法
Vue.prototype.$myMethod = function(){...}
Vue.prototype.$myProperty = xxx
}使用插件：Vue.use()
plugins.js：
export default {
install(Vue){
//全局过滤器
Vue.filter('mySlice',function(value){
return value.slice(0,4)
})
//全局指令（同过滤器）
Vue.directive('fbind',{
//指令与元素成功绑定时（一上来）
bind(element,binding){
element.value = binding.value
},
//指令所在元素被插入页面时
inserted(element,binding){
element.focus()
},
//指令所在的模板被重新解析时
update(element,binding){
element.value = binding.value
}
})
//定义混入
Vue.mixin({
data(){
return{
x:100,
y:200
}
}
})
//给Vue原型上添加一个方法（vm和vc都能使用）
Vue.prototype.hello = ()=>(alert('你好'))
}
}main.js：
//引入Vue
import Vue from "vue";
//引入App
import App from "./App.vue";
//引入插件
import plugins from "./plugins";
Vue.config.productionTip = false
//应用插件
Vue.use(plugins)
//创建vm
new Vue({
el:'#app',
render: h => h(App)
})App.vue：
<template>
<div>
<School/>
<hr>
<Student/>
</div>
</template>
<script>
//引入School组件
import School from './components/School.vue';
import Student from './components/Student.vue';
export default {
name:'App',
components:{
School,
Student
}
}
</script>
School.vue：
<template>
<div>
<h2>学校名称：{{name | mySlice}}</h2>
<h2>学校地址：{{address}}</h2>
<button @click="test">点我测试hello方法</button>
</div>
</template>
<script>
export default {
name:'School',
data(){
return{
name:'尚硅谷atguigu',
address:'北京'
}
},
methods:{
test(){
this.hello()
}
}
}
</script>
Student.vue：
<template>
<div>
<h2>学生姓名：{{name}}</h2>
<h2>学生性别：{{sex}}</h2>
<input type="text" v-fbind:value="name">
</div>
</template>
<script>
export default {
name:'Student',
data(){
return{
name:'张三',
sex:'男'
}
}
}
</script>
scoped样式
作用：让样式在局部生效，防止冲突
写法：<style scoped>
main.js：
//引入Vue
import Vue from "vue";
//引入App
import App from "./App.vue";
Vue.config.productionTip = false
//创建vm
new Vue({
el:'#app',
render: h => h(App)
})App.vue：
<template>
<div>
<School/>
<Student/>
</div>
</template>
<script>
//引入School组件
import School from './components/School.vue';
import Student from './components/Student.vue';
export default {
name:'App',
components:{
School,
Student
}
}
</script>
School.vue：
<template>
<div class="demo">
<h2>学校名称：{{name}}</h2>
<h2>学校地址：{{address}}</h2>
</div>
</template>
<script>
export default {
name:'School',
data(){
return{
name:'尚硅谷atguigu',
address:'北京'
}
}
}
</script>
<style scoped>
.demo{
background-color: skyblue
}
</style>
Student.vue：
<template>
<div class="demo">
<h2>学生姓名：{{name}}</h2>
<h2 class="atguigu">学生性别：{{sex}}</h2>
</div>
</template>
<script>
export default {
name:'Student',
data(){
return{
name:'张三',
sex:'男'
}
},
}
</script>
<style lang="less" scoped>
.demo{
background-color: orange;
.atguigu{
font-size: 40px;
}
}
</style>
总结TodoList案例
组件化编码流程：
1.拆分静态组件：组件要按照功能点拆分，命名不要与html元素冲突
2.实现动态组件：考虑好数据的存放位置，数据是一个组件在用，还是一些组件在用：
(1)一个组件在用：放在组件自身即可
(2)一些组件在用：放在他们共同的父组件上（状态提升）
3.实现交互：从绑定事件开始
props适用于：
1.父组件 ===> 子组件 通信
2.子组件 ===> 父组件 通信（要求父先给子一个函数）
使用v-mode时要切记：v-model绑定的值不能是props传过来的值，因为props是不可以修改的
props传过来的若是对象类型的值，修改对象中的属性时Vue不会报错，但不推荐这样做
main.js：
//引入Vue
import Vue from "vue";
//引入App
import App from "./App.vue";
Vue.config.productionTip = false
//创建vm
new Vue({
el:'#app',
render: h => h(App)
})App.vue：
<template>
<div id="root">
<div class="todo-container">
<div class="todo-wrap">
<MyHeader :addTodo="addTodo"/>
<MyList :todos="todos" :checkedTodo="checkedTodo" :deleteTodo="deleteTodo"/>
<MyFooter :todos="todos" :checkAllTodo="checkAllTodo" :clearAllTodo="clearAllTodo"/>
</div>
</div>
</div>
</template>
<script>
import MyHeader from './components/MyHeader.vue';
import MyList from './components/MyList.vue';
import MyFooter from './components/MyFooter.vue';
export default {
name:'App',
components:{
MyHeader,
MyList,
MyFooter
},
data(){
return{
//由于todos是MyHeader组件和MyFooter组件都在使用，所以放在App中（状态提升）
todos:[
{id:'001',title:'吃饭',done:true},
{id:'002',title:'睡觉',done:false},
{id:'003',title:'开车',done:true}
]
}
},
methods: {
//添加一个todo
addTodo(todoObj){
this.todos.unshift(todoObj)
},
//勾选or取消勾选一个todo
checkedTodo(id){
this.todos.forEach((todo)=>{
if(todo.id == id) todo.done = !todo.done
})
},
//删除一个todo
deleteTodo(id){
this.todos = this.todos.filter((todo)=>{
return todo.id !== id
})
},
//全选or取消全选
checkAllTodo(done){
this.todos.forEach((todo)=>{
todo.done = done
})
},
//清除所有已完成的todo
clearAllTodo(){
this.todos = this.todos.filter((todo)=>{
return !todo.done
})
}
}
}
</script>
<style>
/*base*/
body {
background: #fff;
}
.btn {
display: inline-block;
padding: 4px 12px;
margin-bottom: 0;
font-size: 14px;
line-height: 20px;
text-align: center;
vertical-align: middle;
cursor: pointer;
box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 1px 2px rgba(0, 0, 0, 0.05);
border-radius: 4px;
}
.btn-danger {
color: #fff;
background-color: #da4f49;
border: 1px solid #bd362f;
}
.btn-danger:hover {
color: #fff;
background-color: #bd362f;
}
.btn:focus {
outline: none;
}
.todo-container {
width: 600px;
margin: 0 auto;
}
.todo-container .todo-wrap {
padding: 10px;
border: 1px solid #ddd;
border-radius: 5px;
}
</style>MyFooter.vue：
<template>
<div class="todo-footer" v-show="total">
<label>
<input type="checkbox" :checked="isAll" @change="checkAll"/>
</label>
<span>
<span>已完成{{doneTotal}}</span> / 全部{{total}}
</span>
<button class="btn btn-danger" @click="clearAll">清除已完成任务</button>
</div>
</template>
<script>
export default {
name:'MyFooter',
props:['todos','checkAllTodo','clearAllTodo'],
computed:{
total(){
return this.todos.length
},
doneTotal(){
//第一种方式
let i = 0
this.todos.forEach((todo) => {
if(todo.done) i++
})
return i
//第二种方式
// return this.todos.reduce((pre,todo)=> pre + (todo.done ? 1 : 0),0)
},
isAll(){
return this.doneTotal === this.total && this.total > 0
}
},
methods: {
checkAll(e){
this.checkAllTodo(e.target.checked)
},
clearAll(){
this.clearAllTodo()
}
}
}
</script>
<style scoped>
/*footer*/
.todo-footer {
height: 40px;
line-height: 40px;
padding-left: 6px;
margin-top: 5px;
}
.todo-footer label {
display: inline-block;
margin-right: 20px;
cursor: pointer;
}
.todo-footer label input {
position: relative;
top: -1px;
vertical-align: middle;
margin-right: 5px;
}
.todo-footer button {
float: right;
margin-top: 5px;
}
</style>MyHeader.vue：
<template>
<div class="todo-header">
<input type="text" placeholder="请输入你的任务名称，按回车键确认" v-model="title" @keyup.enter="add"/>
</div>
</template>
<script>
import { nanoid } from 'nanoid';
export default {
name:'MyHeader',
props:['addTodo'],
data() {
return {
title:''
}
},
methods:{
add(){
//校验数据
if(!this.title.trim()) return alert('输入不能为空')
//将用户的输入包装成一个todo对象
const todoObj = {id:nanoid(),title:this.title,done:false}
//通知App组件添加一个todo对象
this.addTodo(todoObj)
//清空输入
this.title = ''
}
}
}
</script>
<style scoped>
/*header*/
.todo-header input {
width: 560px;
height: 28px;
font-size: 14px;
border: 1px solid #ccc;
border-radius: 4px;
padding: 4px 7px;
}
.todo-header input:focus {
outline: none;
border-color: rgba(82, 168, 236, 0.8);
box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075), 0 0 8px rgba(82, 168, 236, 0.6);
}
</style>MyItem.vue：
<template>
<li>
<label>
<input type="checkbox" :checked="todo.done" @change="handleCheck(todo.id)"/>
<!-- 如下代码也能实现功能，但不推荐，违背原则，修改了props -->
<!-- <input type="checkbox" v-model="todo.done"/> -->
<span>{{todo.title}}</span>
</label>
<button class="btn btn-danger" @click="handleDelete(todo.id)">删除</button>
</li>
</template>
<script>
export default {
name:'MyItem',
//声明接收todo对象
props:['todo','checkedTodo','deleteTodo'],
methods: {
//勾选or取消勾选
handleCheck(id){
//通知App组件将对应的todo对象的done值取反
this.checkedTodo(id)
},
//删除
handleDelete(id){
if(confirm('确定删除吗？')){
this.deleteTodo(id)
}
}
},
}
</script>
<style scoped>
/*item*/
li {
list-style: none;
height: 36px;
line-height: 36px;
padding: 0 5px;
border-bottom: 1px solid #ddd;
}
li label {
float: left;
cursor: pointer;
}
li label li input {
vertical-align: middle;
margin-right: 6px;
position: relative;
top: -1px;
}
li button {
float: right;
display: none;
margin-top: 3px;
}
li:before {
content: initial;
}
li:last-child {
border-bottom: none;
}
li:hover{
background-color: #ddd;
}
li:hover button{
display: block;
}
</style>MyList.vue：
<template>
<ul class="todo-main">
<MyItem
v-for="todoObj in todos"
:key="todoObj.id" :todo="todoObj"
:checkedTodo="checkedTodo"
:deleteTodo="deleteTodo"
/>
</ul>
</template>
<script>
import MyItem from './MyItem.vue';
export default {
name:'MyList',
components:{
MyItem
},
props:['todos','checkedTodo','deleteTodo']
}
</script>
<style scoped>
/*main*/
.todo-main {
margin-left: 0px;
border: 1px solid #ddd;
border-radius: 2px;
padding: 0px;
}
.todo-empty {
height: 40px;
line-height: 40px;
border: 1px solid #ddd;
border-radius: 2px;
padding-left: 5px;
margin-top: 10px;
}
</style>webStorage（浏览器本地存储）
存储内容大小一般支持5MB左右（不同的浏览器可能不一样）
浏览器端通过Window.sessionStorage和Window.localStorage属性来实现本地存储机制
相关API：
- xxxxxStorage.setItem('key','value'); //该方法接收一个键和值作为参数，会把键值对添加到存储中，如果键名存在，则更新其对应的值
- xxxxxStorage.getItem('person'); //该方法接收一个键名作为参数，返回键名对应的值
- xxxxxStorage.removeItem('key'); //该方法接收一个键名作为参数，并把该键名从存储中删除
- xxxxxStorage.clear(); //该方法会清空存储中的所有数据
备注：
- sessionStorage存储的内容会随着浏览器窗口关闭而消失
- localStorage存储的内容需要手动消除才会消失
- xxxxxStorage.getItem(xxx)如果xxx对应的value获取不到，那么getItem的返回值是null
- JSON.parse(null)的结果依然是null
localStorage.html：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>localStorage</title>
</head>
<body>
<h2>localStorage</h2>
<button onclick="saveData()">点我保存一个数据</button>
<button onclick="readData()">点我读取一个数据</button>
<button onclick="deleteData()">点我删除一个数据</button>
<button onclick="deleteAllData()">点我清空一个数据</button>
<script type="text/javascript">
let p = {name:'张三',age:18}
function saveData(){
localStorage.setItem('msg','hello!')
localStorage.setItem('msg2',666)
localStorage.setItem('person',JSON.stringify(p))
}
function readData(){
console.log(localStorage.getItem('msg'))
console.log(localStorage.getItem('msg2'))
const result =localStorage.getItem('person')
console.log(JSON.parse(result))
}
function deleteData(){
localStorage.removeItem('msg')
}
function deleteAllData(){
localStorage.clear()
}
</script>
</body>
</html>sessionStorage.html：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>sessionStorage</title>
</head>
<body>
<h2>sessionStorage</h2>
<button onclick="saveData()">点我保存一个数据</button>
<button onclick="readData()">点我读取一个数据</button>
<button onclick="deleteData()">点我删除一个数据</button>
<button onclick="deleteAllData()">点我清空一个数据</button>
<script type="text/javascript">
let p = {name:'张三',age:18}
function saveData(){
sessionStorage.setItem('msg','hello!')
sessionStorage.setItem('msg2',666)
sessionStorage.setItem('person',JSON.stringify(p))
}
function readData(){
console.log(sessionStorage.getItem('msg'))
console.log(sessionStorage.getItem('msg2'))
const result =sessionStorage.getItem('person')
console.log(JSON.parse(result))
}
function deleteData(){
sessionStorage.removeItem('msg')
}
function deleteAllData(){
sessionStorage.clear()
}
</script>
</body>
</html>TodoList本地存储
main.js：
//引入Vue
import Vue from "vue";
//引入App
import App from "./App.vue";
Vue.config.productionTip = false
//创建vm
new Vue({
el:'#app',
render: h => h(App)
})App.vue：
<template>
<div id="root">
<div class="todo-container">
<div class="todo-wrap">
<MyHeader :addTodo="addTodo"/>
<MyList :todos="todos" :checkedTodo="checkedTodo" :deleteTodo="deleteTodo"/>
<MyFooter :todos="todos" :checkAllTodo="checkAllTodo" :clearAllTodo="clearAllTodo"/>
</div>
</div>
</div>
</template>
<script>
import MyHeader from './components/MyHeader.vue';
import MyList from './components/MyList.vue';
import MyFooter from './components/MyFooter.vue';
export default {
name:'App',
components:{
MyHeader,
MyList,
MyFooter
},
data(){
return{
//由于todos是MyHeader组件和MyFooter组件都在使用，所以放在App中（状态提升）
todos:JSON.parse(localStorage.getItem('todos')) || []
}
},
methods: {
//添加一个todo
addTodo(todoObj){
this.todos.unshift(todoObj)
},
//勾选or取消勾选一个todo
checkedTodo(id){
this.todos.forEach((todo)=>{
if(todo.id == id) todo.done = !todo.done
})
},
//删除一个todo
deleteTodo(id){
this.todos = this.todos.filter((todo)=>{
return todo.id !== id
})
},
//全选or取消全选
checkAllTodo(done){
this.todos.forEach((todo)=>{
todo.done = done
})
},
//清除所有已完成的todo
clearAllTodo(){
this.todos = this.todos.filter((todo)=>{
return !todo.done
})
}
},
watch:{
todos:{
deep:true,
handler(value){
localStorage.setItem('todos',JSON.stringify(value))
}
}
}
}
</script>
<style>
/*base*/
body {
background: #fff;
}
.btn {
display: inline-block;
padding: 4px 12px;
margin-bottom: 0;
font-size: 14px;
line-height: 20px;
text-align: center;
vertical-align: middle;
cursor: pointer;
box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 1px 2px rgba(0, 0, 0, 0.05);
border-radius: 4px;
}
.btn-danger {
color: #fff;
background-color: #da4f49;
border: 1px solid #bd362f;
}
.btn-danger:hover {
color: #fff;
background-color: #bd362f;
}
.btn:focus {
outline: none;
}
.todo-container {
width: 600px;
margin: 0 auto;
}
.todo-container .todo-wrap {
padding: 10px;
border: 1px solid #ddd;
border-radius: 5px;
}
</style>MyFooter.vue：
<template>
<div class="todo-footer" v-show="total">
<label>
<input type="checkbox" :checked="isAll" @change="checkAll"/>
</label>
<span>
<span>已完成{{doneTotal}}</span> / 全部{{total}}
</span>
<button class="btn btn-danger" @click="clearAll">清除已完成任务</button>
</div>
</template>
<script>
export default {
name:'MyFooter',
props:['todos','checkAllTodo','clearAllTodo'],
computed:{
//总数
total(){
return this.todos.length
},
//已完成数
doneTotal(){
//第一种方式
let i = 0
this.todos.forEach((todo) => {
if(todo.done) i++
})
return i
//第二种方式（使用reduce方法做条件统计）
// return this.todos.reduce((pre,todo)=> pre + (todo.done ? 1 : 0),0)
},
//控制全选框
isAll(){
return this.doneTotal === this.total && this.total > 0
}
},
methods: {
checkAll(e){
this.checkAllTodo(e.target.checked)
},
clearAll(){
this.clearAllTodo()
}
}
}
</script>
<style scoped>
/*footer*/
.todo-footer {
height: 40px;
line-height: 40px;
padding-left: 6px;
margin-top: 5px;
}
.todo-footer label {
display: inline-block;
margin-right: 20px;
cursor: pointer;
}
.todo-footer label input {
position: relative;
top: -1px;
vertical-align: middle;
margin-right: 5px;
}
.todo-footer button {
float: right;
margin-top: 5px;
}
</style>MyHeader.vue：
<template>
<div class="todo-header">
<input type="text" placeholder="请输入你的任务名称，按回车键确认" v-model="title" @keyup.enter="add"/>
</div>
</template>
<script>
import { nanoid } from 'nanoid';
export default {
name:'MyHeader',
props:['addTodo'],
data() {
return {
title:''
}
},
methods:{
add(){
//校验数据
if(!this.title.trim()) return alert('输入不能为空')
//将用户的输入包装成一个todo对象
const todoObj = {id:nanoid(),title:this.title,done:false}
//通知App组件添加一个todo对象
this.addTodo(todoObj)
//清空输入
this.title = ''
}
}
}
</script>
<style scoped>
/*header*/
.todo-header input {
width: 560px;
height: 28px;
font-size: 14px;
border: 1px solid #ccc;
border-radius: 4px;
padding: 4px 7px;
}
.todo-header input:focus {
outline: none;
border-color: rgba(82, 168, 236, 0.8);
box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075), 0 0 8px rgba(82, 168, 236, 0.6);
}
</style>MyItem.vue：
<template>
<li>
<label>
<input type="checkbox" :checked="todo.done" @change="handleCheck(todo.id)"/>
<!-- 如下代码也能实现功能，但不推荐，违背原则，修改了props -->
<!-- <input type="checkbox" v-model="todo.done"/> -->
<span>{{todo.title}}</span>
</label>
<button class="btn btn-danger" @click="handleDelete(todo.id)">删除</button>
</li>
</template>
<script>
export default {
name:'MyItem',
//声明接收todo对象
props:['todo','checkedTodo','deleteTodo'],
methods: {
//勾选or取消勾选
handleCheck(id){
//通知App组件将对应的todo对象的done值取反
this.checkedTodo(id)
},
//删除
handleDelete(id){
if(confirm('确定删除吗？')){
this.deleteTodo(id)
}
}
},
}
</script>
<style scoped>
/*item*/
li {
list-style: none;
height: 36px;
line-height: 36px;
padding: 0 5px;
border-bottom: 1px solid #ddd;
}
li label {
float: left;
cursor: pointer;
}
li label li input {
vertical-align: middle;
margin-right: 6px;
position: relative;
top: -1px;
}
li button {
float: right;
display: none;
margin-top: 3px;
}
li:before {
content: initial;
}
li:last-child {
border-bottom: none;
}
li:hover{
background-color: #ddd;
}
li:hover button{
display: block;
}
</style>MyList.vue：
<template>
<ul class="todo-main">
<MyItem
v-for="todoObj in todos"
:key="todoObj.id" :todo="todoObj"
:checkedTodo="checkedTodo"
:deleteTodo="deleteTodo"
/>
</ul>
</template>
<script>
import MyItem from './MyItem.vue';
export default {
name:'MyList',
components:{
MyItem
},
props:['todos','checkedTodo','deleteTodo']
}
</script>
<style scoped>
/*main*/
.todo-main {
margin-left: 0px;
border: 1px solid #ddd;
border-radius: 2px;
padding: 0px;
}
.todo-empty {
height: 40px;
line-height: 40px;
border: 1px solid #ddd;
border-radius: 2px;
padding-left: 5px;
margin-top: 10px;
}
</style>组件的自定义事件
一种组件间通信的方式，适用于：子组件 ===> 父组件
使用场景：A是父组件，B是子组件，B想给A传数据，那么就要在A中给B绑定自定义事件（事件的
回调在A中）
绑定自定义事件：
第一种方式：在父组件中：
<Demo @atguigu="test"/>或<Demo v-on:atguigu="test"/>第二种方式：
<Demo ref="demo"/>
......
mounted(){
this.$refs.xxx.$on('atguigu',this.test)
}若想让自定义事件只能触发一次，可以使用once修饰符或$once方法
触发自定义事件：this.$emit('atguigu',数据)
解绑自定义事件：this.$off('atguigu')
组件上也可以绑定原生DOM事件，需要使用native修饰符
注意：通过this.$refs.xxx.$on('atguigu',回调)绑定自定义事件时，回调要么配置在methods中，要
么用箭头函数，否则this指向会出问题
main.js：
//引入Vue
import Vue from "vue";
//引入App
import App from "./App.vue";
Vue.config.productionTip = false
//创建vm
new Vue({
el:'#app',
render: h => h(App),
mounted() {
setTimeout(()=>{
this.$destroy()
},3000)
},
})App.vue：
<template>
<div class="app">
<h1>{{msg}},学生姓名是：{{studentName}}</h1>
<!-- 通过父组件给子组件传递函数类型的props实现：子给父传递数据 -->
<School :getSchoolName="getSchoolName"/>
<!-- 通过父组件给子组件绑定一个自定义事件实现：子给父传递数据（第一种写法：使用@或v-on） -->
<!-- <Student @atguigu="getStudentName" @demo="m1"/> -->
<!-- 通过父组件给子组件绑定一个自定义事件实现：子给父传递数据（第二种写法：使用ref） -->
<Student ref="student" @click.native="show"/>
</div>
</template>
<script>
//引入School组件
import School from './components/School.vue';
import Student from './components/Student.vue';
export default {
name:'App',
components:{
School,
Student
},
data() {
return {
msg:'你好',
studentName:''
}
},
methods:{
getSchoolName(name){
console.log('App收到了学校名：',name)
},
getStudentName(name){
console.log('App收到了学生名：',name)
this.studentName = name
},
m1(){
console.log('demo事件被触发了')
},
show(){
alert(123)
}
},
mounted() {
this.$refs.student.$on('atguigu',this.getStudentName) //绑定自定义事件
// this.$refs.student.$once('atguigu',this.getStudentName) //绑定自定义事件（一次性）
}
}
</script>
<style scoped>
.app{
background-color: gray;
padding: 5px
}
</style>
School.vue：
<template>
<div class="school">
<h2>学校名称：{{name}}</h2>
<h2>学校地址：{{address}}</h2>
<button @click="sendSchoolName">把学校名给App</button>
</div>
</template>
<script>
export default {
name:'School',
props:['getSchoolName'],
data(){
return{
name:'尚硅谷',
address:'北京'
}
},
methods:{
sendSchoolName(){
this.getSchoolName(this.name)
}
}
}
</script>
<style scoped>
.school{
background-color: skyblue;
padding: 5px;
}
</style>
Student.vue：
<template>
<div class="student">
<h2>学生姓名：{{name}}</h2>
<h2>学生性别：{{sex}}</h2>
<h2>当前求和为：{{number}}</h2>
<button @click="add">点我number++</button>
<button @click="sendStudentName">把学生名给App</button>
<button @click="unbind">解绑atguigu事件</button>
<button @click="death">销毁当前Student组件的实例（vc）</button>
</div>
</template>
<script>
export default {
name:'Student',
data(){
return{
name:'张三',
sex:'男',
number:0
}
},
methods: {
add(){
console.log('add回调被调用了')
this.number++
},
sendStudentName(){
//触发Student组件实例上的aiguigu事件
this.$emit('atguigu',this.name)
// this.$emit('demo')
this.$emit('click')
},
unbind(){
this.$off('atguigu') //解绑一个自定义事件
// this.$off(['atguigu','demo']) //解绑多个自定义事件
// this.$off() //解绑所有的自定义事件
},
death(){
this.$destroy() //销毁了当前Student组件的实例，销毁后所有Student实例的自定义事件全都不奏效
}
},
}
</script>
<style lang="less" scoped>
.student{
background-color: orange;
padding: 5px;
margin-top: 30px
}
</style>
全局事件总线（GlobalEventBus）
一种组件间通信的方式，适用于任意组件间通信
安装全局事件总线：
new Vue({
......
beforeCreate(){
Vue.prototype.$bus = this //安装全局事件总线，$bus就是当前应用的vm
}
......
})使用事件总线：
1.接收数据：A组件想接收数据，则在A组件中给$bus绑定自定义事件，事件的回调留在A组件本身
methods:{
demo(data){
......
}
}
......
mounted(){
this.$bus.$on('xxxx',this.demo)
}2.提供数据：this.$bus.$emit('xxxx',数据)
说明：最好在beforeDestroy钩子中，用$off去解绑当前组件所用到的事件
main.js：
//引入Vue
import Vue from "vue";
//引入App
import App from "./App.vue";
Vue.config.productionTip = false
//创建vm
new Vue({
el:'#app',
render: h => h(App),
beforeCreate(){
Vue.prototype.$bus = this //安装全局事件总线
}
})App.vue：
<template>
<div class="app">
<h1>{{msg}}</h1>
<School/>
<Student/>
</div>
</template>
<script>
//引入School组件
import School from './components/School.vue';
import Student from './components/Student.vue';
export default {
name:'App',
components:{
School,
Student
},
data() {
return {
msg:'你好'
}
}
}
</script>
<style scoped>
.app{
background-color: gray;
padding: 5px
}
</style>
School.vue：
<template>
<div class="school">
<h2>学校名称：{{name}}</h2>
<h2>学校地址：{{address}}</h2>
</div>
</template>
<script>
export default {
name:'School',
props:['getSchoolName'],
data(){
return{
name:'尚硅谷',
address:'北京'
}
},
mounted(){
console.log('School',this)
this.$bus.$on('hello',(data)=>{
console.log('我是School组件，收到了数据',data)
})
},
beforeDestroy() {
this.$bus.$off('hello')
},
}
</script>
<style scoped>
.school{
background-color: skyblue;
padding: 5px;
}
</style>
Student.vue：
<template>
<div class="student">
<h2>学生姓名：{{name}}</h2>
<h2>学生性别：{{sex}}</h2>
<button @click="sendStudentName">把学生名给School组件</button>
</div>
</template>
<script>
export default {
name:'Student',
data(){
return{
name:'张三',
sex:'男'
}
},
methods:{
sendStudentName(){
this.$bus.$emit('hello',this.name)
}
}
}
</script>
<style lang="less" scoped>
.student{
background-color: orange;
padding: 5px;
margin-top: 30px
}
</style>
TodoList事件总线
main.js：
//引入Vue
import Vue from "vue";
//引入App
import App from "./App.vue";
Vue.config.productionTip = false
//创建vm
new Vue({
el:'#app',
render: h => h(App),
beforeCreate(){
Vue.prototype.$bus = this
}
})App.vue：
<template>
<div id="root">
<div class="todo-container">
<div class="todo-wrap">
<MyHeader @addTodo="addTodo"/>
<MyList :todos="todos"/>
<MyFooter :todos="todos" @checkAllTodo="checkAllTodo" @clearAllTodo="clearAllTodo"/>
</div>
</div>
</div>
</template>
<script>
import MyHeader from './components/MyHeader.vue';
import MyList from './components/MyList.vue';
import MyFooter from './components/MyFooter.vue';
export default {
name:'App',
components:{
MyHeader,
MyList,
MyFooter
},
data(){
return{
//由于todos是MyHeader组件和MyFooter组件都在使用，所以放在App中（状态提升）
todos:JSON.parse(localStorage.getItem('todos')) || []
}
},
methods: {
//添加一个todo
addTodo(todoObj){
this.todos.unshift(todoObj)
},
//勾选or取消勾选一个todo
checkedTodo(id){
this.todos.forEach((todo)=>{
if(todo.id == id) todo.done = !todo.done
})
},
//删除一个todo
deleteTodo(id){
this.todos = this.todos.filter((todo)=>{
return todo.id !== id
})
},
//全选or取消全选
checkAllTodo(done){
this.todos.forEach((todo)=>{
todo.done = done
})
},
//清除所有已完成的todo
clearAllTodo(){
this.todos = this.todos.filter((todo)=>{
return !todo.done
})
}
},
watch:{
todos:{
deep:true,
handler(value){
localStorage.setItem('todos',JSON.stringify(value))
}
}
},
mounted() {
this.$bus.$on('checkedTodo',this.checkedTodo)
this.$bus.$on('deleteTodo',this.deleteTodo)
},
beforeDestroy(){
this.$bus.$off('checkedTodo')
this.$bus.$off('deleteTodo')
}
}
</script>
<style>
/*base*/
body {
background: #fff;
}
.btn {
display: inline-block;
padding: 4px 12px;
margin-bottom: 0;
font-size: 14px;
line-height: 20px;
text-align: center;
vertical-align: middle;
cursor: pointer;
box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 1px 2px rgba(0, 0, 0, 0.05);
border-radius: 4px;
}
.btn-danger {
color: #fff;
background-color: #da4f49;
border: 1px solid #bd362f;
}
.btn-danger:hover {
color: #fff;
background-color: #bd362f;
}
.btn:focus {
outline: none;
}
.todo-container {
width: 600px;
margin: 0 auto;
}
.todo-container .todo-wrap {
padding: 10px;
border: 1px solid #ddd;
border-radius: 5px;
}
</style>MyFooter.vue：
<template>
<div class="todo-footer" v-show="total">
<label>
<input type="checkbox" :checked="isAll" @change="checkAll"/>
</label>
<span>
<span>已完成{{doneTotal}}</span> / 全部{{total}}
</span>
<button class="btn btn-danger" @click="clearAll">清除已完成任务</button>
</div>
</template>
<script>
export default {
name:'MyFooter',
props:['todos'],
computed:{
//总数
total(){
return this.todos.length
},
//已完成数
doneTotal(){
//第一种方式
let i = 0
this.todos.forEach((todo) => {
if(todo.done) i++
})
return i
//第二种方式（使用reduce方法做条件统计）
// return this.todos.reduce((pre,todo)=> pre + (todo.done ? 1 : 0),0)
},
//控制全选框
isAll(){
return this.doneTotal === this.total && this.total > 0
}
},
methods: {
checkAll(e){
// this.checkAllTodo(e.target.checked)
this.$emit('checkAllTodo',e.target.checked)
},
clearAll(){
// this.clearAllTodo()
this.$emit('clearAllTodo')
}
}
}
</script>
<style scoped>
/*footer*/
.todo-footer {
height: 40px;
line-height: 40px;
padding-left: 6px;
margin-top: 5px;
}
.todo-footer label {
display: inline-block;
margin-right: 20px;
cursor: pointer;
}
.todo-footer label input {
position: relative;
top: -1px;
vertical-align: middle;
margin-right: 5px;
}
.todo-footer button {
float: right;
margin-top: 5px;
}
</style>MyHeader.vue：
<template>
<div class="todo-header">
<input type="text" placeholder="请输入你的任务名称，按回车键确认" v-model="title" @keyup.enter="add"/>
</div>
</template>
<script>
import { nanoid } from 'nanoid';
export default {
name:'MyHeader',
data() {
return {
title:''
}
},
methods:{
add(){
//校验数据
if(!this.title.trim()) return alert('输入不能为空')
//将用户的输入包装成一个todo对象
const todoObj = {id:nanoid(),title:this.title,done:false}
//通知App组件添加一个todo对象
this.$emit('addTodo',todoObj)
//清空输入
this.title = ''
}
}
}
</script>
<style scoped>
/*header*/
.todo-header input {
width: 560px;
height: 28px;
font-size: 14px;
border: 1px solid #ccc;
border-radius: 4px;
padding: 4px 7px;
}
.todo-header input:focus {
outline: none;
border-color: rgba(82, 168, 236, 0.8);
box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075), 0 0 8px rgba(82, 168, 236, 0.6);
}
</style>MyItem.vue：
<template>
<li>
<label>
<input type="checkbox" :checked="todo.done" @change="handleCheck(todo.id)"/>
<!-- 如下代码也能实现功能，但不推荐，违背原则，修改了props -->
<!-- <input type="checkbox" v-model="todo.done"/> -->
<span>{{todo.title}}</span>
</label>
<button class="btn btn-danger" @click="handleDelete(todo.id)">删除</button>
</li>
</template>
<script>
export default {
name:'MyItem',
//声明接收todo对象
props:['todo'],
methods: {
//勾选or取消勾选
handleCheck(id){
//通知App组件将对应的todo对象的done值取反
// this.checkedTodo(id)
this.$bus.$emit('checkedTodo',id)
},
//删除
handleDelete(id){
if(confirm('确定删除吗？')){
// this.deleteTodo(id)
this.$bus.$emit('deleteTodo',id)
}
}
}
}
</script>
<style scoped>
/*item*/
li {
list-style: none;
height: 36px;
line-height: 36px;
padding: 0 5px;
border-bottom: 1px solid #ddd;
}
li label {
float: left;
cursor: pointer;
}
li label li input {
vertical-align: middle;
margin-right: 6px;
position: relative;
top: -1px;
}
li button {
float: right;
display: none;
margin-top: 3px;
}
li:before {
content: initial;
}
li:last-child {
border-bottom: none;
}
li:hover{
background-color: #ddd;
}
li:hover button{
display: block;
}
</style>MyList.vue：
<template>
<ul class="todo-main">
<MyItem
v-for="todoObj in todos"
:key="todoObj.id" :todo="todoObj"
/>
</ul>
</template>
<script>
import MyItem from './MyItem.vue';
export default {
name:'MyList',
components:{
MyItem
},
props:['todos']
}
</script>
<style scoped>
/*main*/
.todo-main {
margin-left: 0px;
border: 1px solid #ddd;
border-radius: 2px;
padding: 0px;
}
.todo-empty {
height: 40px;
line-height: 40px;
border: 1px solid #ddd;
border-radius: 2px;
padding-left: 5px;
margin-top: 10px;
}
</style>消息订阅与发布（pubsub）
一种组件间通信的方式，适用于任意组件间通信
使用步骤：
1.安装pubsub：npm i pubsub-js
2.引入：import pubsub from 'pubsub-js'
3.接收数据：A组件想接收数据，则在A组件中订阅消息，订阅的回调留在A组件自身
methods:{
demo(data){......}
}
......
mounted(){
this.pid = pubsub.subscribe('xxx',this.demo) //订阅消息
}4.提供数据：pubsub.publish('xxx',数据)
5.最好在beforeDestroy钩子中，用pubsub.unsubscribe(pid)去<span style="color:red">取消订阅</span>
main.js：
//引入Vue
import Vue from "vue";
//引入App
import App from "./App.vue";
Vue.config.productionTip = false
//创建vm
new Vue({
el:'#app',
render: h => h(App)
})App.vue：
<template>
<div class="app">
<h1>{{msg}}</h1>
<School/>
<Student/>
</div>
</template>
<script>
//引入School组件
import School from './components/School.vue';
import Student from './components/Student.vue';
export default {
name:'App',
components:{
School,
Student
},
data() {
return {
msg:'你好'
}
}
}
</script>
<style scoped>
.app{
background-color: gray;
padding: 5px
}
</style>
School.vue：
<template>
<div class="school">
<h2>学校名称：{{name}}</h2>
<h2>学校地址：{{address}}</h2>
</div>
</template>
<script>
import pubsub from 'pubsub-js'
export default {
name:'School',
props:['getSchoolName'],
data(){
return{
name:'尚硅谷',
address:'北京'
}
},
methods: {
demo(msgName,data){
console.log('有人发布了hello消息，hello消息的回调执行了',data,this)
}
},
mounted(){
// console.log('School',this)
// this.$bus.$on('hello',(data)=>{
// console.log('我是School组件，收到了数据',data)
// })
this.pubId = pubsub.subscribe('hello',this.demo)
},
beforeDestroy() {
// this.$bus.$off('hello')
pubsub.unsubscribe(this.pubId)
},
}
</script>
<style scoped>
.school{
background-color: skyblue;
padding: 5px;
}
</style>
Student.vue：
<template>
<div class="student">
<h2>学生姓名：{{name}}</h2>
<h2>学生性别：{{sex}}</h2>
<button @click="sendStudentName">把学生名给School组件</button>
</div>
</template>
<script>
import pubsub from 'pubsub-js'
export default {
name:'Student',
data(){
return{
name:'张三',
sex:'男'
}
},
methods:{
sendStudentName(){
// this.$bus.$emit('hello',this.name)
pubsub.publish('hello',666)
}
}
}
</script>
<style lang="less" scoped>
.student{
background-color: orange;
padding: 5px;
margin-top: 30px
}
</style>
TodoList_pubsub
main.js：
//引入Vue
import Vue from "vue";
//引入App
import App from "./App.vue";
Vue.config.productionTip = false
//创建vm
new Vue({
el:'#app',
render: h => h(App),
beforeCreate(){
Vue.prototype.$bus = this
}
})App.vue：
<template>
<div id="root">
<div class="todo-container">
<div class="todo-wrap">
<MyHeader @addTodo="addTodo"/>
<MyList :todos="todos"/>
<MyFooter :todos="todos" @checkAllTodo="checkAllTodo" @clearAllTodo="clearAllTodo"/>
</div>
</div>
</div>
</template>
<script>
import pubsub from 'pubsub-js'
import MyHeader from './components/MyHeader.vue';
import MyList from './components/MyList.vue';
import MyFooter from './components/MyFooter.vue';
export default {
name:'App',
components:{
MyHeader,
MyList,
MyFooter
},
data(){
return{
//由于todos是MyHeader组件和MyFooter组件都在使用，所以放在App中（状态提升）
todos:JSON.parse(localStorage.getItem('todos')) || []
}
},
methods: {
//添加一个todo
addTodo(todoObj){
this.todos.unshift(todoObj)
},
//勾选or取消勾选一个todo
checkedTodo(id){
this.todos.forEach((todo)=>{
if(todo.id == id) todo.done = !todo.done
})
},
//删除一个todo
deleteTodo(_,id){
this.todos = this.todos.filter((todo)=>{
return todo.id !== id
})
},
//全选or取消全选
checkAllTodo(done){
this.todos.forEach((todo)=>{
todo.done = done
})
},
//清除所有已完成的todo
clearAllTodo(){
this.todos = this.todos.filter((todo)=>{
return !todo.done
})
}
},
watch:{
todos:{
deep:true,
handler(value){
localStorage.setItem('todos',JSON.stringify(value))
}
}
},
mounted() {
this.$bus.$on('checkedTodo',this.checkedTodo)
this.pubId = pubsub.subscribe('deleteTodo',this.deleteTodo)
},
beforeDestroy(){
this.$bus.$off('checkedTodo')
pubsub.unsubscribe(this.pubId)
}
}
</script>
<style>
/*base*/
body {
background: #fff;
}
.btn {
display: inline-block;
padding: 4px 12px;
margin-bottom: 0;
font-size: 14px;
line-height: 20px;
text-align: center;
vertical-align: middle;
cursor: pointer;
box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 1px 2px rgba(0, 0, 0, 0.05);
border-radius: 4px;
}
.btn-danger {
color: #fff;
background-color: #da4f49;
border: 1px solid #bd362f;
}
.btn-danger:hover {
color: #fff;
background-color: #bd362f;
}
.btn:focus {
outline: none;
}
.todo-container {
width: 600px;
margin: 0 auto;
}
.todo-container .todo-wrap {
padding: 10px;
border: 1px solid #ddd;
border-radius: 5px;
}
</style>MyFooter.vue：
<template>
<div class="todo-footer" v-show="total">
<label>
<input type="checkbox" :checked="isAll" @change="checkAll"/>
</label>
<span>
<span>已完成{{doneTotal}}</span> / 全部{{total}}
</span>
<button class="btn btn-danger" @click="clearAll">清除已完成任务</button>
</div>
</template>
<script>
export default {
name:'MyFooter',
props:['todos'],
computed:{
//总数
total(){
return this.todos.length
},
//已完成数
doneTotal(){
//第一种方式
let i = 0
this.todos.forEach((todo) => {
if(todo.done) i++
})
return i
//第二种方式（使用reduce方法做条件统计）
// return this.todos.reduce((pre,todo)=> pre + (todo.done ? 1 : 0),0)
},
//控制全选框
isAll(){
return this.doneTotal === this.total && this.total > 0
}
},
methods: {
checkAll(e){
// this.checkAllTodo(e.target.checked)
this.$emit('checkAllTodo',e.target.checked)
},
clearAll(){
// this.clearAllTodo()
this.$emit('clearAllTodo')
}
}
}
</script>
<style scoped>
/*footer*/
.todo-footer {
height: 40px;
line-height: 40px;
padding-left: 6px;
margin-top: 5px;
}
.todo-footer label {
display: inline-block;
margin-right: 20px;
cursor: pointer;
}
.todo-footer label input {
position: relative;
top: -1px;
vertical-align: middle;
margin-right: 5px;
}
.todo-footer button {
float: right;
margin-top: 5px;
}
</style>MyHeader.vue：
<template>
<div class="todo-header">
<input type="text" placeholder="请输入你的任务名称，按回车键确认" v-model="title" @keyup.enter="add"/>
</div>
</template>
<script>
import { nanoid } from 'nanoid';
export default {
name:'MyHeader',
data() {
return {
title:''
}
},
methods:{
add(){
//校验数据
if(!this.title.trim()) return alert('输入不能为空')
//将用户的输入包装成一个todo对象
const todoObj = {id:nanoid(),title:this.title,done:false}
//通知App组件添加一个todo对象
this.$emit('addTodo',todoObj)
//清空输入
this.title = ''
}
}
}
</script>
<style scoped>
/*header*/
.todo-header input {
width: 560px;
height: 28px;
font-size: 14px;
border: 1px solid #ccc;
border-radius: 4px;
padding: 4px 7px;
}
.todo-header input:focus {
outline: none;
border-color: rgba(82, 168, 236, 0.8);
box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075), 0 0 8px rgba(82, 168, 236, 0.6);
}
</style>MyItem.vue：
<template>
<li>
<label>
<input type="checkbox" :checked="todo.done" @change="handleCheck(todo.id)"/>
<!-- 如下代码也能实现功能，但不推荐，违背原则，修改了props -->
<!-- <input type="checkbox" v-model="todo.done"/> -->
<span>{{todo.title}}</span>
</label>
<button class="btn btn-danger" @click="handleDelete(todo.id)">删除</button>
</li>
</template>
<script>
import pubsub from 'pubsub-js'
export default {
name:'MyItem',
//声明接收todo对象
props:['todo'],
methods: {
//勾选or取消勾选
handleCheck(id){
//通知App组件将对应的todo对象的done值取反
// this.checkedTodo(id)
this.$bus.$emit('checkedTodo',id)
},
//删除
handleDelete(id){
if(confirm('确定删除吗？')){
// this.deleteTodo(id)
// this.$bus.$emit('deleteTodo',id)
pubsub.publish('deleteTodo',id)
}
}
}
}
</script>
<style scoped>
/*item*/
li {
list-style: none;
height: 36px;
line-height: 36px;
padding: 0 5px;
border-bottom: 1px solid #ddd;
}
li label {
float: left;
cursor: pointer;
}
li label li input {
vertical-align: middle;
margin-right: 6px;
position: relative;
top: -1px;
}
li button {
float: right;
display: none;
margin-top: 3px;
}
li:before {
content: initial;
}
li:last-child {
border-bottom: none;
}
li:hover{
background-color: #ddd;
}
li:hover button{
display: block;
}
</style>MyList.vue：
<template>
<ul class="todo-main">
<MyItem
v-for="todoObj in todos"
:key="todoObj.id" :todo="todoObj"
/>
</ul>
</template>
<script>
import MyItem from './MyItem.vue';
export default {
name:'MyList',
components:{
MyItem
},
props:['todos']
}
</script>
<style scoped>
/*main*/
.todo-main {
margin-left: 0px;
border: 1px solid #ddd;
border-radius: 2px;
padding: 0px;
}
.todo-empty {
height: 40px;
line-height: 40px;
border: 1px solid #ddd;
border-radius: 2px;
padding-left: 5px;
margin-top: 10px;
}
</style>nextTick
语法：this.$nextTick（回调函数）
作用：在下一次DOM更新结束后执行其指定的回调
什么时候用：当改变数据后，要基于更新后的新DOM进行某些操作时，要在nextTick所指定的回调函数中执行
main.js：
//引入Vue
import Vue from "vue";
//引入App
import App from "./App.vue";
Vue.config.productionTip = false
//创建vm
new Vue({
el:'#app',
render: h => h(App),
beforeCreate(){
Vue.prototype.$bus = this
}
})App.vue：
<template>
<div id="root">
<div class="todo-container">
<div class="todo-wrap">
<MyHeader @addTodo="addTodo"/>
<MyList :todos="todos"/>
<MyFooter :todos="todos" @checkAllTodo="checkAllTodo" @clearAllTodo="clearAllTodo"/>
</div>
</div>
</div>
</template>
<script>
import pubsub from 'pubsub-js'
import MyHeader from './components/MyHeader.vue';
import MyList from './components/MyList.vue';
import MyFooter from './components/MyFooter.vue';
export default {
name:'App',
components:{
MyHeader,
MyList,
MyFooter
},
data(){
return{
//由于todos是MyHeader组件和MyFooter组件都在使用，所以放在App中（状态提升）
todos:JSON.parse(localStorage.getItem('todos')) || []
}
},
methods: {
//添加一个todo
addTodo(todoObj){
this.todos.unshift(todoObj)
},
//勾选or取消勾选一个todo
checkedTodo(id){
this.todos.forEach((todo)=>{
if(todo.id == id) todo.done = !todo.done
})
},
//删除一个todo
deleteTodo(_,id){
this.todos = this.todos.filter((todo)=>{
return todo.id !== id
})
},
//全选or取消全选
checkAllTodo(done){
this.todos.forEach((todo)=>{
todo.done = done
})
},
//清除所有已完成的todo
clearAllTodo(){
this.todos = this.todos.filter((todo)=>{
return !todo.done
})
},
//更新一个todo
updateTodo(id,title){
this.todos.forEach((todo)=>{
if(todo.id == id) todo.title = title
})
}
},
watch:{
todos:{
deep:true,
handler(value){
localStorage.setItem('todos',JSON.stringify(value))
}
}
},
mounted() {
this.$bus.$on('checkedTodo',this.checkedTodo)
this.pubId = pubsub.subscribe('deleteTodo',this.deleteTodo)
this.$bus.$on('updateTodo',this.updateTodo)
},
beforeDestroy(){
this.$bus.$off('checkedTodo')
pubsub.unsubscribe(this.pubId)
this.$bus.$off('updateTodo')
}
}
</script>
<style>
/*base*/
body {
background: #fff;
}
.btn {
display: inline-block;
padding: 4px 12px;
margin-bottom: 0;
font-size: 14px;
line-height: 20px;
text-align: center;
vertical-align: middle;
cursor: pointer;
box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 1px 2px rgba(0, 0, 0, 0.05);
border-radius: 4px;
}
.btn-danger {
color: #fff;
background-color: #da4f49;
border: 1px solid #bd362f;
}
.btn-edit {
color: #fff;
background-color: skyblue;
border: 1px solid rgb(102, 159, 181);
margin-right: 5px
}
.btn-edit:hover {
color: #fff;
background-color: rgb(102, 159, 181);
}
.btn-danger:hover {
color: #fff;
background-color: #bd362f;
}
.btn:focus {
outline: none;
}
.todo-container {
width: 600px;
margin: 0 auto;
}
.todo-container .todo-wrap {
padding: 10px;
border: 1px solid #ddd;
border-radius: 5px;
}
</style>MyFooter.vue：
<template>
<div class="todo-footer" v-show="total">
<label>
<input type="checkbox" :checked="isAll" @change="checkAll"/>
</label>
<span>
<span>已完成{{doneTotal}}</span> / 全部{{total}}
</span>
<button class="btn btn-danger" @click="clearAll">清除已完成任务</button>
</div>
</template>
<script>
export default {
name:'MyFooter',
props:['todos'],
computed:{
//总数
total(){
return this.todos.length
},
//已完成数
doneTotal(){
//第一种方式
let i = 0
this.todos.forEach((todo) => {
if(todo.done) i++
})
return i
//第二种方式（使用reduce方法做条件统计）
// return this.todos.reduce((pre,todo)=> pre + (todo.done ? 1 : 0),0)
},
//控制全选框
isAll(){
return this.doneTotal === this.total && this.total > 0
}
},
methods: {
checkAll(e){
// this.checkAllTodo(e.target.checked)
this.$emit('checkAllTodo',e.target.checked)
},
clearAll(){
// this.clearAllTodo()
this.$emit('clearAllTodo')
}
}
}
</script>
<style scoped>
/*footer*/
.todo-footer {
height: 40px;
line-height: 40px;
padding-left: 6px;
margin-top: 5px;
}
.todo-footer label {
display: inline-block;
margin-right: 20px;
cursor: pointer;
}
.todo-footer label input {
position: relative;
top: -1px;
vertical-align: middle;
margin-right: 5px;
}
.todo-footer button {
float: right;
margin-top: 5px;
}
</style>MyHeader.vue：
<template>
<div class="todo-header">
<input type="text" placeholder="请输入你的任务名称，按回车键确认" v-model="title" @keyup.enter="add"/>
</div>
</template>
<script>
import { nanoid } from 'nanoid';
export default {
name:'MyHeader',
data() {
return {
title:''
}
},
methods:{
add(){
//校验数据
if(!this.title.trim()) return alert('输入不能为空')
//将用户的输入包装成一个todo对象
const todoObj = {id:nanoid(),title:this.title,done:false}
//通知App组件添加一个todo对象
this.$emit('addTodo',todoObj)
//清空输入
this.title = ''
}
}
}
</script>
<style scoped>
/*header*/
.todo-header input {
width: 560px;
height: 28px;
font-size: 14px;
border: 1px solid #ccc;
border-radius: 4px;
padding: 4px 7px;
}
.todo-header input:focus {
outline: none;
border-color: rgba(82, 168, 236, 0.8);
box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075), 0 0 8px rgba(82, 168, 236, 0.6);
}
</style>MyItem.vue：
<template>
<li>
<label>
<input type="checkbox" :checked="todo.done" @change="handleCheck(todo.id)"/>
<!-- 如下代码也能实现功能，但不推荐，违背原则，修改了props -->
<!-- <input type="checkbox" v-model="todo.done"/> -->
<span v-show="!todo.isEdit">{{todo.title}}</span>
<input
type="text"
v-show="todo.isEdit"
:value="todo.title"
@blur="handleBlur(todo,$event)"
ref="inputTitle"
>
</label>
<button class="btn btn-danger" @click="handleDelete(todo.id)">删除</button>
<button class="btn btn-edit" @click="handleEdit(todo)" v-show="!todo.isEdit">编辑</button>
</li>
</template>
<script>
import pubsub from 'pubsub-js'
export default {
name:'MyItem',
//声明接收todo对象
props:['todo'],
methods: {
//勾选or取消勾选
handleCheck(id){
//通知App组件将对应的todo对象的done值取反
// this.checkedTodo(id)
this.$bus.$emit('checkedTodo',id)
},
//删除
handleDelete(id){
if(confirm('确定删除吗？')){
// this.deleteTodo(id)
// this.$bus.$emit('deleteTodo',id)
pubsub.publish('deleteTodo',id)
}
},
//编辑
handleEdit(todo){
if(todo.hasOwnProperty('isEdit')){
todo.isEdit = true
}else{
this.$set(todo,'isEdit',true)
}
this.$nextTick(function(){
this.$refs.inputTitle.focus()
})
},
//失去焦点回调（真正执行修改逻辑）
handleBlur(todo,e){
todo.isEdit = false
if(!e.target.value.trim()) return alert('输入不能为空！')
this.$bus.$emit('updateTodo',todo.id,e.target.value)
}
}
}
</script>
<style scoped>
/*item*/
li {
list-style: none;
height: 36px;
line-height: 36px;
padding: 0 5px;
border-bottom: 1px solid #ddd;
}
li label {
float: left;
cursor: pointer;
}
li label li input {
vertical-align: middle;
margin-right: 6px;
position: relative;
top: -1px;
}
li button {
float: right;
display: none;
margin-top: 3px;
}
li:before {
content: initial;
}
li:last-child {
border-bottom: none;
}
li:hover{
background-color: #ddd;
}
li:hover button{
display: block;
}
</style>MyList.vue：
<template>
<ul class="todo-main">
<MyItem
v-for="todoObj in todos"
:key="todoObj.id" :todo="todoObj"
/>
</ul>
</template>
<script>
import MyItem from './MyItem.vue';
export default {
name:'MyList',
components:{
MyItem
},
props:['todos']
}
</script>
<style scoped>
/*main*/
.todo-main {
margin-left: 0px;
border: 1px solid #ddd;
border-radius: 2px;
padding: 0px;
}
.todo-empty {
height: 40px;
line-height: 40px;
border: 1px solid #ddd;
border-radius: 2px;
padding-left: 5px;
margin-top: 10px;
}
</style>Vue封装的过渡与动画
作用：在插入、更新或移除DOM元素时，在合适的时候给元素添加样式类名
图示：
写法：
1.准备好样式：
(1)元素进入的样式：
v-enter：进入的起点
v-enter-active：进入过程中
v-enter-to：进入的终点
(2)元素离开的样式：
v-leave：离开的起点
v-leave-active：离开过程中
v-leave-to：离开的终点
2.使用<transition>包裹要过渡的元素，并配置name属性：
<transition name="hello">
<h1 v-show="isShow">你好</h1>
</transition>3.备注：若有多个元素需要过渡，则需要使用：<transition-group>，且每个元素都要指定key值
main.js：
//引入Vue
import Vue from "vue";
//引入App
import App from "./App.vue";
Vue.config.productionTip = false
//创建vm
new Vue({
el:'#app',
render: h => h(App),
beforeCreate(){
Vue.prototype.$bus = this
}
})App.vue：
<template>
<div>
<Demo/>
<Demo2/>
<Demo3/>
</div>
</template>
<script>
import Demo from './components/Demo.vue'
import Demo2 from './components/Demo2.vue'
import Demo3 from './components/Demo3.vue'
export default {
name:'App',
components:{
Demo,
Demo2,
Demo3
}
}
</script>
Demo.vue：
<template>
<div>
<button @click="isShow = !isShow">显示/隐藏</button>
<transition name="hello" appear>
<h1 v-show="isShow">你好</h1>
</transition>
</div>
</template>
<script>
export default {
name:'Demo',
data() {
return {
isShow:true
}
}
}
</script>
<style>
h1{
background-color: orange;
}
.hello-enter-active{
animation: atguigu 0.5s linear;
}
.hello-leave-active{
animation: atguigu 0.5s linear reverse;
}
@keyframes atguigu {
from{
transform: translateX(-100%);
}
to{
transform: translateX(0px);
}
}
</style>Demo2.vue：
<template>
<div>
<button @click="isShow = !isShow">显示/隐藏</button>
<transition-group name="hello" appear>
<h1 v-show="!isShow" key="1">你好</h1>
<h1 v-show="isShow" key="2">尚硅谷</h1>
</transition-group>
</div>
</template>
<script>
export default {
name:'Demo',
data() {
return {
isShow:true
}
}
}
</script>
<style scoped>
h1{
background-color: orange;
}
/* 进入的起点，离开的终点 */
.hello-enter,.hello-leave-to{
transform: translateX(-100%);
}
.hello-enter-active,.hello-leave-active{
transform: 0.5s linear;
}
/* 进入的终点，离开的起点 */
.hello-enter-to,.hello-leave{
transform: translateX(0);
}
</style>Demo3.vue：
<template>
<div>
<button @click="isShow = !isShow">显示/隐藏</button>
<transition-group
name="animate__animated animate__bounce"
appear
enter-active-class="animate__swing"
leave-active-class="animate__backOutUp"
>
<h1 v-show="!isShow" key="1">你好</h1>
<h1 v-show="isShow" key="2">尚硅谷</h1>
</transition-group>
</div>
</template>
<script>
import 'animate.css'
export default {
name:'Demo',
data() {
return {
isShow:true
}
}
}
</script>
<style scoped>
h1{
background-color: orange;
}
</style>TodoList_动画
main.js：
//引入Vue
import Vue from "vue";
//引入App
import App from "./App.vue";
Vue.config.productionTip = false
//创建vm
new Vue({
el:'#app',
render: h => h(App),
beforeCreate(){
Vue.prototype.$bus = this
}
})App.vue：
<template>
<div id="root">
<div class="todo-container">
<div class="todo-wrap">
<MyHeader @addTodo="addTodo"/>
<MyList :todos="todos"/>
<MyFooter :todos="todos" @checkAllTodo="checkAllTodo" @clearAllTodo="clearAllTodo"/>
</div>
</div>
</div>
</template>
<script>
import pubsub from 'pubsub-js'
import MyHeader from './components/MyHeader.vue';
import MyList from './components/MyList.vue';
import MyFooter from './components/MyFooter.vue';
export default {
name:'App',
components:{
MyHeader,
MyList,
MyFooter
},
data(){
return{
//由于todos是MyHeader组件和MyFooter组件都在使用，所以放在App中（状态提升）
todos:JSON.parse(localStorage.getItem('todos')) || []
}
},
methods: {
//添加一个todo
addTodo(todoObj){
this.todos.unshift(todoObj)
},
//勾选or取消勾选一个todo
checkedTodo(id){
this.todos.forEach((todo)=>{
if(todo.id == id) todo.done = !todo.done
})
},
//删除一个todo
deleteTodo(_,id){
this.todos = this.todos.filter((todo)=>{
return todo.id !== id
})
},
//全选or取消全选
checkAllTodo(done){
this.todos.forEach((todo)=>{
todo.done = done
})
},
//清除所有已完成的todo
clearAllTodo(){
this.todos = this.todos.filter((todo)=>{
return !todo.done
})
},
//更新一个todo
updateTodo(id,title){
this.todos.forEach((todo)=>{
if(todo.id == id) todo.title = title
})
}
},
watch:{
todos:{
deep:true,
handler(value){
localStorage.setItem('todos',JSON.stringify(value))
}
}
},
mounted() {
this.$bus.$on('checkedTodo',this.checkedTodo)
this.pubId = pubsub.subscribe('deleteTodo',this.deleteTodo)
this.$bus.$on('updateTodo',this.updateTodo)
},
beforeDestroy(){
this.$bus.$off('checkedTodo')
pubsub.unsubscribe(this.pubId)
this.$bus.$off('updateTodo')
}
}
</script>
<style>
/*base*/
body {
background: #fff;
}
.btn {
display: inline-block;
padding: 4px 12px;
margin-bottom: 0;
font-size: 14px;
line-height: 20px;
text-align: center;
vertical-align: middle;
cursor: pointer;
box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 1px 2px rgba(0, 0, 0, 0.05);
border-radius: 4px;
}
.btn-danger {
color: #fff;
background-color: #da4f49;
border: 1px solid #bd362f;
}
.btn-edit {
color: #fff;
background-color: skyblue;
border: 1px solid rgb(102, 159, 181);
margin-right: 5px
}
.btn-edit:hover {
color: #fff;
background-color: rgb(102, 159, 181);
}
.btn-danger:hover {
color: #fff;
background-color: #bd362f;
}
.btn:focus {
outline: none;
}
.todo-container {
width: 600px;
margin: 0 auto;
}
.todo-container .todo-wrap {
padding: 10px;
border: 1px solid #ddd;
border-radius: 5px;
}
</style>MyFooter.vue：
<template>
<div class="todo-footer" v-show="total">
<label>
<input type="checkbox" :checked="isAll" @change="checkAll"/>
</label>
<span>
<span>已完成{{doneTotal}}</span> / 全部{{total}}
</span>
<button class="btn btn-danger" @click="clearAll">清除已完成任务</button>
</div>
</template>
<script>
export default {
name:'MyFooter',
props:['todos'],
computed:{
//总数
total(){
return this.todos.length
},
//已完成数
doneTotal(){
//第一种方式
let i = 0
this.todos.forEach((todo) => {
if(todo.done) i++
})
return i
//第二种方式（使用reduce方法做条件统计）
// return this.todos.reduce((pre,todo)=> pre + (todo.done ? 1 : 0),0)
},
//控制全选框
isAll(){
return this.doneTotal === this.total && this.total > 0
}
},
methods: {
checkAll(e){
// this.checkAllTodo(e.target.checked)
this.$emit('checkAllTodo',e.target.checked)
},
clearAll(){
// this.clearAllTodo()
this.$emit('clearAllTodo')
}
}
}
</script>
<style scoped>
/*footer*/
.todo-footer {
height: 40px;
line-height: 40px;
padding-left: 6px;
margin-top: 5px;
}
.todo-footer label {
display: inline-block;
margin-right: 20px;
cursor: pointer;
}
.todo-footer label input {
position: relative;
top: -1px;
vertical-align: middle;
margin-right: 5px;
}
.todo-footer button {
float: right;
margin-top: 5px;
}
</style>MyHeader.vue：
<template>
<div class="todo-header">
<input type="text" placeholder="请输入你的任务名称，按回车键确认" v-model="title" @keyup.enter="add"/>
</div>
</template>
<script>
import { nanoid } from 'nanoid';
export default {
name:'MyHeader',
data() {
return {
title:''
}
},
methods:{
add(){
//校验数据
if(!this.title.trim()) return alert('输入不能为空')
//将用户的输入包装成一个todo对象
const todoObj = {id:nanoid(),title:this.title,done:false}
//通知App组件添加一个todo对象
this.$emit('addTodo',todoObj)
//清空输入
this.title = ''
}
}
}
</script>
<style scoped>
/*header*/
.todo-header input {
width: 560px;
height: 28px;
font-size: 14px;
border: 1px solid #ccc;
border-radius: 4px;
padding: 4px 7px;
}
.todo-header input:focus {
outline: none;
border-color: rgba(82, 168, 236, 0.8);
box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075), 0 0 8px rgba(82, 168, 236, 0.6);
}
</style>MyItem.vue：
<template>
<transition name="todo" appear>
<li>
<label>
<input type="checkbox" :checked="todo.done" @change="handleCheck(todo.id)"/>
<!-- 如下代码也能实现功能，但不推荐，违背原则，修改了props -->
<!-- <input type="checkbox" v-model="todo.done"/> -->
<span v-show="!todo.isEdit">{{todo.title}}</span>
<input
type="text"
v-show="todo.isEdit"
:value="todo.title"
@blur="handleBlur(todo,$event)"
ref="inputTitle"
>
</label>
<button class="btn btn-danger" @click="handleDelete(todo.id)">删除</button>
<button class="btn btn-edit" @click="handleEdit(todo)" v-show="!todo.isEdit">编辑</button>
</li>
</transition>
</template>
<script>
import pubsub from 'pubsub-js'
export default {
name:'MyItem',
//声明接收todo对象
props:['todo'],
methods: {
//勾选or取消勾选
handleCheck(id){
//通知App组件将对应的todo对象的done值取反
// this.checkedTodo(id)
this.$bus.$emit('checkedTodo',id)
},
//删除
handleDelete(id){
if(confirm('确定删除吗？')){
// this.deleteTodo(id)
// this.$bus.$emit('deleteTodo',id)
pubsub.publish('deleteTodo',id)
}
},
//编辑
handleEdit(todo){
if(todo.hasOwnProperty('isEdit')){
todo.isEdit = true
}else{
this.$set(todo,'isEdit',true)
}
this.$nextTick(function(){
this.$refs.inputTitle.focus()
})
},
//失去焦点回调（真正执行修改逻辑）
handleBlur(todo,e){
todo.isEdit = false
if(!e.target.value.trim()) return alert('输入不能为空！')
this.$bus.$emit('updateTodo',todo.id,e.target.value)
}
}
}
</script>
<style scoped>
/*item*/
li {
list-style: none;
height: 36px;
line-height: 36px;
padding: 0 5px;
border-bottom: 1px solid #ddd;
}
li label {
float: left;
cursor: pointer;
}
li label li input {
vertical-align: middle;
margin-right: 6px;
position: relative;
top: -1px;
}
li button {
float: right;
display: none;
margin-top: 3px;
}
li:before {
content: initial;
}
li:last-child {
border-bottom: none;
}
li:hover{
background-color: #ddd;
}
li:hover button{
display: block;
}
.todo-enter-active{
animation: atguigu 0.5s linear;
}
.todo-leave-active{
animation: atguigu 0.5s linear reverse;
}
@keyframes atguigu {
from{
transform: translateX(100%);
}
to{
transform: translateX(0px);
}
}
</style>MyList.vue：
<template>
<ul class="todo-main">
<MyItem
v-for="todoObj in todos"
:key="todoObj.id" :todo="todoObj"
/>
</ul>
</template>
<script>
import MyItem from './MyItem.vue';
export default {
name:'MyList',
components:{
MyItem
},
props:['todos']
}
</script>
<style scoped>
/*main*/
.todo-main {
margin-left: 0px;
border: 1px solid #ddd;
border-radius: 2px;
padding: 0px;
}
.todo-empty {
height: 40px;
line-height: 40px;
border: 1px solid #ddd;
border-radius: 2px;
padding-left: 5px;
margin-top: 10px;
}
</style>
