【vue】vue子孙组件传值（多级嵌套）attrs listeners

如果vue开发遇到多层嵌套，
子孙组件之间传值，
可以使用 attrs listeners传值。

示例如下：
孙子组件：

<template>
    <div class="wrap">
        孙子组件
        {{code.code1}}
        <button @click="func">click</button>
    </div>
</template>

<script>
    export default {
        name: "grandson",
        props:{
            code:{
                type:Object,
                default:()=>{}
            }
        },
        data(){
            return{

            }
        },
        mounted(){
            console.log(this.$attrs)
        },
        methods:{
            func(){
                console.log("发射---》")
                this.$emit('msg',"可以")
            }
        }
    }
</script>

<style scoped>
    .wrap{
        width: 30%;
        height: 100vh;
        border: solid 5px;
    }
</style>

父组件：

<template>
<div class="wrap">
 父组件
    <grandson :code="$attrs" v-on="$listeners"></grandson>
</div>
</template>

<script>
    import grandson from './grandson'
    export default {
        name: "father",
        components:{
            grandson
        },
        /*props:{
            code:{
                type:String,
                default:''
            }
        },*/
        mounted(){
            console.log("父组件---->",this.$attrs)

        }
    }
</script>

<style scoped>
    .wrap{
        width: 70%;
        height: 100vh;
        border: solid 5px;
    }
</style>

祖父组件

<template>
<div class="wrap">
    祖父组件{{str}}
    <father :code="code" :code1="code1" @msg="msg"></father>
</div>
</template>

<script>
    import father from './father'
    export default {
        name: "grandFather",
        components:{
            father
        },
        data(){
            return{
                code:"2023",
                code1:"2022",
                str:''
            }
        },
        methods:{
            msg(a){
                console.log("接收msg--->",a)
                this.str=a
            }
        }
    }
</script>

<style scoped>
.wrap{
    width: 100%;
    height: 100vh;
    border: solid 5px;
}
</style>