<!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>
    </div>
    <template id="cpn">
        <div>
            <ccpn></ccpn>
        </div>
    </template>
    <template id="ccpn">
            <div>我是子组件
            <button @click="btnClick">按钮</button>
        </div>
        </template>
    <script src="./js/vue.js"></script>
    <script>
        const app = new Vue({
            el: '#app',
            data: {
                message: '你好呀'
            },
            components: {
                cpn: {
                    template: '#cpn',
                    data() {
                        return {
                            name: '我是cpn组件的name'
                        }
                    },
                    methods: {
                        btnClick() {
                            //访问父组件
                            console.log(this.$parent)
                        }
                    },
                    components: {
                        ccpn: {
                            template: '#ccpn',
                            methods: {
                                btnClick() {
                                    console.log(this.$parent)
                                    console.log(this.$parent.name)
                                    console.log(this.$root)
                                }
                            }
                        }
                    }
                }
            }

        })
    </script>
</body>

</html>

运行结果