VUE2.0組件的傳值問題

Vue1.0元件間傳遞

　　使用$on()監聽事件；
使用$emit()在它上面觸發事件；
　　使用$dispatch()派發事件，事件沿著父鏈冒泡；
　　使用$broadcast()廣播事件，事件向下傳導給所有的後代

Vue2.0後$dispatch()，$broadcast()被棄用，請參閱https://cn.vuejs.org/v2/guide/migration.html#dispatch-和-broadcast-替換

1.子元件傳送值給父元件的：

Child.vue

<template>
  <p>
    </p>
<h1 id="子组件">子组件</h1>
    <button>想父组件传值</button>
  
</template>
<script>
  export default{
    name: &#39;child&#39;,
    data(){
      return {}
    },
    methods: {
      childToParent(){
        this.$emit("childToParentMsg", "子组件向父组件传值");
      }
    }
  }
</script>parent.vue

<template>
  <p>
    </p>
<h1 id="父组件">父组件</h1>
    <child></child>
  
</template>
<script>
  import Child from &#39;./child/Child.vue&#39;
  export default{
      name:"parent",
    data(){
      return {
      }
    },
    methods: {
      showChildToParentMsg:function(data){
        alert("父组件显示信息："+data)
      }
    },
    components: {Child}
  }
</script>

2.父元件傳值給子元件

parent.vue

<template>
  <p>
    </p>
<h1 id="父组件">父组件</h1>
    <child></child>
  
</template>
<script>
  import Child from &#39;./child/Child.vue&#39;
  export default{
     name:"parent",
    data(){
      return {
        parentMsg:&#39;父组件向子组件传值&#39;
      }
    },
    components: {Child}
  }
</script>

child.vue

#

<template>
  <p>
    </p>
<h1 id="子组件">子组件</h1>
    <span>子组件显示信息：{{parentToChild}}</span><br>
  
</template>
<script>
  export default{
    name: &#39;child&#39;,
    data(){
      return {}
    },
    props:["parentToChild"]
  }
</script>

3.採用eventBus.js傳值---兄弟元件間的傳值

eventBus.js

import Vue from 'Vue'
export default new Vue()

 App.vue

<template>
  <p>
    <secondchild></secondchild>
    <firstchild></firstchild>
  </p>
</template>

<script>
import FirstChild from &#39;./components/FirstChild&#39;
import SecondChild from &#39;./components/SecondChild&#39;

export default {
  name: &#39;app&#39;,
  components: {
    FirstChild,
    SecondChild,
  }
}
</script>

FirstChild.vue

#

<template>
  <p>
    <input>
    <button>向组件传值</button>
    <br>
    <span>{{message}}</span>
  </p>
</template>
<script>
  import bus from &#39;../assets/eventBus&#39;;
  export default{
    name: &#39;firstChild&#39;,
    data () {
      return {
        message: &#39;你好&#39;
      }
    },
    methods: {
      showMessage () {
       alert(this.message)        bus.$emit(&#39;userDefinedEvent&#39;, this.message);//传值
      }
    }
  }
</script>

 SecondChild.vue

#

<template>
    <p>
        </p>
<h1 id="message">{{message}}</h1>
    
</template>
<script>
    import bus from &#39;../assets/eventBus&#39;;
    export default{
        name:&#39;SecondChild&#39;,
        data(){
            return {
                message: &#39;&#39;
            }
        },
        mounted(){
            var self = this;            
            bus.$on(&#39;userDefinedEvent&#39;,function(message){                
            self.message = message;//接值            
            });
        }
    }</script>

以上是VUE2.0組件的傳值問題的詳細內容。更多資訊請關注PHP中文網其他相關文章！