uniapp 组件传参

父组件

<v-sub @returnDate=returnDate :backGround=backGround></v-sub>

import vSub from "../../../components/v-sub.vue"
    export default {
        components:{
            vSub
        },
        data() {
            return {
                backGround:"#000"
            }
        },
        methods: {
            returnDate(e){
                console.log("接收到的值==>>"+e)
            }
        }
    }

<device ref="device" :stoId="storeId" v-show="active == 'device'">
        </device>
        <battery ref="battery" :stoId="storeId" v-show="active == 'battery'">
        </battery>
        
import device from './components/device.vue'
    import battery from './components/battery.vue'
    export default {
        components: {
            device,
            battery
        },
        data() {
            return {
                storeId: null, // 参数storeId
                active: 'device' // 切换tab
            }
        },

子组件

<template>
    <view class="content" :style="[{background:backGround}]">
        <button @tap="passValue">点击传值</button>
    </view>
</template>
 
<script>
    export default {
        props:{
            backGround:{
                type:String,
                default:"#fff"
            }
        },
        methods:{
            passValue(){
                this.$emit("returnDate","yoyoyo")
            }
        }
    }
</script>
 
<style>
    .content{
        width: 400upx;
        height: 400upx;
    }
</style>

子类接收父类的数据,就会用到props