<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
</head>
<body>

<div id="app">
  <cpn ref="aaa"></cpn>
  <cpn ref="bbb"></cpn>
  <button @click="btnClick">按钮</button>
</div>

<template id="cpn">
  <div>我是子组件</div>
</template>
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
<script>
  const app = new Vue({
    el: '#app',
    data: {
      message: '你好啊'
    },
    methods: {
      btnClick() {
        // 1.$children
        console.log(this.$children);
        for (let c of this.$children) {
          console.log(c.name);
          c.showMessage();
        }
        // console.log(this.$children[3].name);

        // 2.$refs => 对象类型, 默认是一个空的对象 ref='bbb'
        console.log(this.$refs.bbb.name);
      }
    },
    components: {
      cpn: {
        template: '#cpn',
        data() {
          return {
            name: '我是子组件的name'
          }
        },
        methods: {
          showMessage() {
            console.log('showMessage111111111');
          }
        }
      },
    }
  })
</script>

</body>
</html>

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