【uniapp】子组件和父组件双向绑定，vue3已废除sync写法，v-model代替

vue3已废除sync写法，v-model代替
实现state的值可以从子组件传递给父组件，也可以从父组件传递给子组件

文件地址pages/about/about.vue
<template><view><button size="mini" @click="clickBtn">开启{{mystate}}</button><mypop v-model:state="mystate"></mypop></view>
</template><script>export default {data() {return {mystate:false};},methods:{clickBtn(){this.mystate=true},}}
</script><style lang="scss"></style>

文件地址components/mypop/mypop.vue
<template><view><view>---弹出框样式---</view><view class="box" :style="{height:state?'300rpx':'0'}">{{state}}</view><button size="mini" @click="closeBtn"> 关闭{{state}}</button></view>
</template><script>export default {name:"mypop",data() {return {};},props:{state:{type:Boolean,default:false}},methods:{closeBtn(){this.$emit("update:state",false)}}}
</script><style lang="scss">
.box{width: 300rpx;height: 300rpx;background: pink;
}
</style>