vue3 setup 父组件向子组件传递参数、方法|子组件向父组件传递数据,函数-526互联

https://blog.csdn.net/qq_27517377/article/details/123163381
https://blog.csdn.net/qq_27517377/article/details/123166367

vue3 setup 父组件向子组件传递参数

<template>
<el-row class="mb-4">
	<el-button type="danger">props.vue传递父组件的参数到子组件，子组件用defineProps接收,fatherTitle和fatherMoney参数</el-button>
</el-row>
 
<!--传递父组件的参数到子组件-->
<Son :fatherTitle="xxxxx" :fatherMoney="money" :fatherWifi="wifi" :thisIsEmpty="myEmptyStr" :fatherArr="myArr"></Son>
</template>
 
<script lang="ts" setup>
import { ref,reactive,watch,watchEffect } from 'vue'
import Son from "./son.vue"//引入子组件
 
const  xxxxx = ref("-----这是父组件的标题-----")
const money = ref(9999999999)
const wifi = reactive({pwd:222,name:"fffff"})
const myEmptyStr = ref("")
const myArr = reactive([{code:666,msg:"success"},{code:555,msg:"fail"}])
</script>

<template>
<el-row class="mb-4">
	<el-button type="success">son.vue:{{sonTitle}}-------{{fatherTitle}}-----{{fatherMoney}}</el-button>
	<el-button type="success">{{fatherWifi}}--{{fatherWifi.pwd}}--{{fatherWifi.name}}</el-button>
	<el-button type="danger">父传递的空字符串：{{myEmptyStr}}</el-button>
</el-row>
<el-row class="mb-4">
  <el-button type="primary" v-for="(item,index) in fatherArr" :key="index">{{item}},{{item.code}}</el-button>
</el-row>
 
</template>
<script lang="ts" setup>
import { ref,reactive} from 'vue'
const sonTitle = "This is  son title"
//接收父组件传过来的值,需要注意defineProps只能在setup语法糖里面使用，不需要import引入
const yyyy = defineProps({
	fatherTitle:{
		type:String,//类型字符串
		default:'当前Child.vue的默认值'//如果没有传递msg参数,默认值是这个
	},
	fatherMoney:{
		type:Number,//类型字符串
		default:0//如果没有传递msg参数,默认值是这个
	},
	fatherWifi:{
		type:Object,//类型字符串
		default:{id:999}//如果没有传递msg参数,默认值是这个
	},
	myEmptyStr:{
		type:String,
		default:"myEmptyStr默认值为空字符串"
	},
	fatherArr:{
		type:Object,//类型字符串
		//default:[]//如果没有传递msg参数,默认值是这个
	},
})
 
console.log(yyyy.fatherArr)
console.log("-------这是子组件---------")
console.log(yyyy.fatherWifi)
console.log(yyyy.fatherTitle)
 
</script>

 
<script lang="ts" setup>
import { ref,reactive} from 'vue'
 
//子组件调用父组件的方法，
//父组件的调用子组件的地方写上@onMySonFunc="fatherFunc"
const myEmit = defineEmits(["onMySonFunc"])//这样就调用到父组件的fatherFunc方法了
 
//传递参数： "调用父组件的方法"和666666
myEmit("onMySonFunc","调用父组件的方法",666666)
</script>

<template>
<!--子组件调用父组件的funcToSon()方法-->
<Son  @onMySonFunc="funcToSon"></Son>
</template>
 
<script lang="ts" setup>
import { ref,reactive} from 'vue'
import Son from "./son.vue"//引入子组件
 
const funcToSon = (name:any,id:number)=>{
	console.log("子组件调用了父组件的funcToSon()方法",id)
	return {message:name}
}
</script>

子组件向父组件传递数据,函数

<script lang="ts" setup>
import { ref,reactive} from 'vue'
 
const sonToFather = (yourParam:string)=>{
    console.log(yourParam+"子组件自定义的sonToFather()方发被执行了")
    return reactive({f:"篮球",g:"国足"})
}
//暴露参数出去,其他地方用onMounted接收
defineExpose({
    uid:"我是son.vue的defineExpose暴露的参数",
    name:"defineExpose 向父组件传递的参数",
    sonToFather//子组件暴露出去的方法
})
 
</script>

<template>
<!--传递父组件的fatherTitle参数到子组件,getFromMySons接收子组件的参数和方发-->
<Son :fatherTitle="xxxxx"  ref="getFromMySons"></Son>
</template>
 
<script lang="ts" setup>
import { ref,reactive,onMounted } from 'vue'
import Son from "./son.vue"//引入子组件
 
 
//接收子组件传递过来的参数和方发
const getFromMySons = ref()//这个名字要跟上面子组件的ref="getFromMySons"名字一样
onMounted(()=>{//用onMounted接收子组件暴露的参数和方发
	console.log("onMounted接收子组件传递过来的参数")
	console.log(getFromMySons.value)
	console.log(getFromMySons.value.name,getFromMySons.value.uid)
	
    //执行子组件的方发
	console.log(getFromMySons.value.sonToFather("爸爸执行子组件的sonToFather方发->"))
})
</script>