vue comprehensive component communication use case

This time I will bring you a use case of vue comprehensive component communication. What are the precautions when using vue comprehensive component communication. The following is a practical case, let's take a look.

The example in this article shares the communication between vue comprehensive components for your reference. The specific content is as follows

Implement a ToDoList.

①Complete the creation and use of all components

②add

When the add button is clicked, the content entered by the user (todoinput) is displayed in (todolist)

Core code: Communication between sibling components
Step 1: var bus = new Vue()
Step 2: In the component that is ready to receive data

bus.$on('addEvent',function(){
})

Step 3: Trigger event

bus.$emit('addEvent',123)

Render the elements of array in todolist in each span tag of todoitem. (Parent-child component communication)

③delete

When you click the delete button in a todoitem, the todoitem will be deleted because the number of todoitem depends on the array

in the todolist. Communication between child component and parent component:

nbsp;html>


  <meta>
  <title>Title</title>
  <script></script>
  <script></script>


<p>
  </p><p>{{msg}}</p>
  <todobox></todobox>

<script>
  <!--兄弟间通信-->
  var bus = new Vue();
//  input组件
  Vue.component("todoinput",{
//    保存用户输入的数据
    data:function(){
      return{
        userInput:""
      }
    },
    methods:{
      sendInput:function(){
//        触发自定义事件，将this.userInput这个传递到todolist
        bus.$emit("addEvent",this.userInput);
        this.userInput = "";
      }
    },
    template: `
      <p>
        <h1>待做事项
        <input type="text" placeholder="健身" v-model="userInput"/>
        <button @click="sendInput">Add
      
       `
  })
//  列表组件
  Vue.component("todolist",{
//    保存传递来的用户输入的数据
    data:function(){
      return{
        inputList:[]
      }
    },
    beforeMount:function(){
//      触发绑定
//      msg就是事件触发后传递过来的数据
      //var that = this;
      bus.$on("addEvent",(msg)=>{
//        保存到数组inputList中
        this.inputList.push (msg) ;
      })
    },
    template: `
    <p>
      <ul>
        <todoitem v-bind:content="tmp" v-for="(tmp,index) in inputList" v-bind:key="index" v-bind:myIndex="index">
      
    
       `
//    出现警告，加下标，提高列表渲染
  })
//  item组件
  Vue.component("todoitem",{
//    props子组件获取父组件的数据，将todolist中的内容以及内容的下标获取
    props:["content","myIndex"],
    methods:{
//      通过下标删除
      deleteList:function(){
        this.$parent.inputList.splice(this.myIndex,1);
      }
    },
    template: `
    <p>
      <li>
        <button @click="deleteList">delete
         <span>{{content}}
      
    
       `
  })
//根组件
  Vue.component("todobox",{
    template:`
      <p>
        <todoinput>
        <todolist>
      
    `
  })
  new Vue({
    el: "#container",
    data: {
      msg: "Hello Vue"
    }
  })
</script>

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