与上一篇Vue中TodoList案例_添加有三个文件变化了

App.vue：中加了checkTodo方法

<template>
  <div id="root">
    <div class="todo-container">
      <div class="todo-wrap">
        <MyHeader :addTodo="addTodo"/>
        <MyList :todos="todos" :checkTodo="checkTodo"/>
        <MyFooter/>
      </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
        })
    }
  }
}
</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：中拿到checkTodo，再传给MyItem

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

<script>
import MyItem from "./MyItem";
export default {
  name: "MyList",
  components:{
    MyItem
  },
  props:['todos','checkTodo']
}
</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：定义change改变时候触发方法将id传给App.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" style="display:none">删除</button>
    </li>
  </div>
</template>

<script>
export default {
  name: "MyItem",
  //声明接收对象
  props:[
      'todo',
      'checkTodo'
  ],
  methods:{
    handleCheck(id){
      //通知App组件将对应的todo对象的done值取反
      this.checkTodo(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;
}
</style>

效果：勾选时候数据动态变化