父组件调用子组件中的方法- this.$refs.xxx.子组件方法();

{
    <template>
    <div>
        <button @click="clickParent">点击 调用子组件</button>
        <child ref="mychild"></child>
    </div>
    </template>
    <script>
    import Child from "../zi/zi";
    export default {
    components: {
        child: Child  //key:value key是组件名称  value是被引入时的名称
    },
    methods: {
        clickParent() {
        this.$refs.mychild.parentHandleclick();
        }
    }
    };
    </script>
}

{
    <template>
      <div ref="col">child</div>
    </template>
    <script>
        export default {
            methods: {
                parentHandleclick(e) {
                console.log("我是子组件在说")
                }
            }
        };
    </script>
}