<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>

<body>
    <div id="app">
        <cpn></cpn>
        <cpn></cpn>
        <cpn></cpn>
        <button @click="btnClick">按钮</button>
    </div>
    <template id="cpn">
        <div>我是子组件</div>
    </template>
    <script src="./js/vue.js"></script>
    <script>
        const app = new Vue({
            el: '#app',
            data: {
                message: '你好呀'
            },
            methods: {
                btnClick() {
                    console.log(this.$children)
                    for (let c of this.$children) {
                        console.log(c.name)
                        c.showMessage();
                    }
                }
            },
            components: {
                cpn: {
                    template: '#cpn',
                    data() {
                        return {
                            name: '我是子组件的name'
                        }
                    },
                    methods: {
                        showMessage() {
                            console.log('我是子组件')
                        }
                    }
                }
            }
        })
    </script>
</body>

</html>

运行结果