Vue中TodoList案例

Vue中TodoList案例_总结

news2024/11/26 0:28:40

完整项目：

App.vue

<template>
  <div id="root">
    <div class="todo-container">
      <div class="todo-wrap">
        <MyHeader :addTodo="addTodo"/>
        <MyList :todos="todos" :checkTodo="checkTodo" :deleteTodo="deleteTodo"/>
        <MyFooter :todos="todos" :checkAllTodo="checkAllTodo" :clearAllTodo="clearAllTodo"/>
      </div>
    </div>
  </div>

</template>

<script>
import MyHeader from './components/MyHeader'
import MyList from './components/MyList'
import MyFooter from './components/MyFooter'

export default {
  name:'App',
  components:{MyHeader,MyList,MyFooter},
  data(){
    return{
      todos:[
        {id:'001',title:'唱',done:true},
        {id:'002',title:'跳',done:false},
        {id:'003',title:'rap',done:true},
        {id:'004',title:'篮球',done:true}
      ]
    }
  },
  methods:{
    //添加一个todo
      addTodo(todoObj){
        this.todos.unshift(todoObj)
    },
    //勾选or取消勾选一个todo
    checkTodo(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
        })
    },
    //清除所有已经完成的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>

MyList.vue

<template>
  <ul class="todo-main">
    <MyItem v-for="todoObj in todos"
            :key="todoObj.id"
            :todo="todoObj"
            :checkTodo="checkTodo"
            :deleteTodo="deleteTodo"
    />
  </ul>
</template>

<script>
import MyItem from "./MyItem";
export default {
  name: "MyList",
  components:{
    MyItem
  },
  props:['todos','checkTodo','deleteTodo']
}
</script>

<style scoped>
.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>

MyItem.vue

<template>
  <div>
    <li>
      <label >
        <input type="checkbox" :checked="todo.done" @change="handleCheck(todo.id)"/> <!--给input指定一个checked选项，如果是true就勾选上，如果是false就不勾选-->
        <span>{{todo.title}}</span>
      </label>
      <button class="btn btn-danger" @click="handleDelete(todo.id)">删除</button>
    </li>
  </div>
</template>

<script>
export default {
  name: "MyItem",
  //声明接收对象
  props:[
      'todo',
      'checkTodo',
      '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.checkTodo(id)
    },
    //删除
    handleDelete(id){
        if (confirm('确定删除吗')){  //confirm根据用户的交互来决定到底是布尔值为真还是为假，点击确定为真，点击取消为假
          this.deleteTodo(id)
        }
    }
  }
}
</script>

<style scoped>
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>

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"><!--绑定一个键盘事件，按下回车再走逻辑.enter-->
  </div>
</template>

<script>
import {nanoid} from 'nanoid'
export default {
  name: "MyHeader",
  props:['addTodo'],
  data(){
    return{
      title:''
    }
  },
  methods:{
      add(){
        if (!this.title.trim()) return //trim()清楚空格
        //将用户的输入，包装成一个todo对象
        const todoObj = {id:nanoid(),title:this.title,done:false}
        //同志App组件去添加一个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>

MyFooter.vue

<template>
  <div class="todo-footer" v-show="total">
    <label>
<!--      <input type="checkbox" :checked="isAll" @change="checkAll"/>-->
      <input type="checkbox" v-model="isAll"/>
    </label>
    <span>
           <span>已完成{{doneTotal}}</span> / 全部{{total}}
       </span>
    <button class="btn btn-danger" @click="clearAll">清除已完成的任务</button>
  </div>
</template>

<script>
export default {
  name: "MyFooter",
  props:[
      'todos',
      'checkAllTodo',
      'clearAllTodo'
  ],
  computed:{
    total(){
      return this.todos.length
    },
    doneTotal(){
     /* const x = this.todos.reduce((pre,current)=>{
          console.log('@',pre,current)
          return pre+(current.done?1:0)
      },0)*/
      return  this.todos.reduce((pre,todo)=>pre+(todo.done?1:0),0)
    },
    isAll:{
      get(){
        return this.doneTotal === this.total && this.total>0
      },
      set(checked){
        this.checkAllTodo(checked)
      }
    }
  },
  methods:{
    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>

main.js

//引入Vue
import Vue from 'vue'
//引入App
import App from "./App";
//关闭Vue的生产提示
Vue.config.productionTip = false
//创建vm
new Vue({
    el:'#app',
    render:h=>h(App)
})

index.html

<!DOCTYPE html>
<html lang="">
  <head>
    <meta charset="utf-8">
<!--      针对IE浏览器的一个特殊配置，含义是让IE浏览器以最高的渲染级别渲染页面-->
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
<!--      开启移动端的理想视口-->
    <meta name="viewport" content="width=device-width,initial-scale=1.0">
<!--      配置页签图标，<%= BASE_URL %>指的是从public路径开始往后-->
    <link rel="icon" href="<%= BASE_URL %>favicon.ico">
<!--      配置网页标题-->
    <title><%= htmlWebpackPlugin.options.title %></title>
  </head>
  <body>
<!--  当浏览器不支持js时noscript中的元素就会被渲染-->
    <noscript>
      <strong>We're sorry but <%= htmlWebpackPlugin.options.title %> doesn't work properly without JavaScript enabled. Please enable it to continue.</strong>
    </noscript>
<!--    容器-->
    <div id="app"></div>
    <!-- built files will be auto injected -->
  </body>
</html>