去官网学习→Props | Vue.js

运行示例：

 

 代码：App.vue

<template>
  <img alt="Vue logo" src="./assets/logo.png">

  <h2>Vue Props数据传递</h2>
  <h4>子组件中的数据：{{ content }}</h4>
  
  <!-- 自定义事件 @onEvent getHandle方法 -->
  <MyComponent @onEvent="getHandle"/>


</template>

<script>

import MyComponent from "./components/MyComponent.vue"

export default {
  name: 'App',
  data(){
    return{
      content:""
    }
  },
  components: {
    MyComponent
  },
  methods:{
    getHandle(data){
      // 获取到子组件的数据 data
     // alert(data);
     this.content = data;
    }
  }
}
</script>

<style>
#app {
  font-family: Avenir, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  color: #2c3e50;
  margin-top: 60px;
}
</style>

  代码：MyComponent.vue

<template>
    <button @click="sendHandle">向父组件传递数据</button>
</template>

<script>

export default {
    name:"MyComponent",
    data(){
        return{
            content:"子组件中的内容",
            numb:100
        }
    },
    methods:{
        sendHandle(){
             //$emit(event: string, ...args: any[])
            // .$emit 往父组件传递数据
            this.$emit("onEvent",[this.content,this.numb])
        }
    }
    
}
</script>

<style scoped>

</style>