Vue中$emit的用法

子组件可以使用$emit调用父组件的方法并传递数据

示例

子组件：

<template>
  <div>
      <button @click="sendMsgToParent">向父组件传值</button>
  </div>
</template>

<script>
  export default {
    methods: {
      sendMsgToParent:function () {
        this.$emit("childMsg","hello world!");
      }
    }
  }
</script>

父组件：

<template>
  <div id="app">
    //@childMsg 与子组件中this.$emit("childMsg","hello world!")起的名字一致
    <child @childMsg="showChildMsg"></child>
  </div>
</template>

<script>
  import child from './components/Child'
  export default {
    name: "app",
    components: {
      child
    },
    methods:{
      showChildMsg:function (data) {
        console.log(data);
      }
    }
  }
</script>