Vue 子组件调用父组件的属性，方法「建议收藏」

//父组件
<template>
    <div>
        <label>我是父组件</label>
        <child @fatherMethod="test"></child>
    </div>
</template>
<script>
import child from './components/child';
export default{
    components:{child},
    methods:{
        test(){
            console.info("test");
        }
    }
}
</script>


//子组件
<template>
    <div>
        <label>我是子组件</label>
        <button @click="btn_Click()">调用父组件方法</child>
    </div>
</template>
<script>
import child from './components/child';
export default{
    components:{child},
    methods:{
        btn_Click(){
            this.$emit('fatherMethod')；
        }
    }
}
</script>

<template>
    <div>
        <label>我是父组件</label>
        <child :userNmae="name"></child>
    </div>
</template>
<script>
import child from './components/child';
export default{
    data(){
        return{
            name:"whz"
        }
    }
    components:{child}
}
</script>

<template>
    <div>
        当前用户：
        <label>{
  
  {userName}}</label>
    </div>
</template>
<script>
    export default {
      name:'child',
      props:["userName"]
    }
<script>