1. 子组件的写法，
   需要从setup函数中引出{emit}

<template>
  <div id="center" v-if="isShow">
    <h2><slot>my model</slot></h2>
    <el-button type="primary" @click="btnclose">传递事件</el-button>
    <el-button type="primary" @click="btnparents">子组件触发父组件的方法</el-button>
  </div>
</template>

<script lang="ts">
import {
  defineComponent,getCurrentInstance
} from "vue";
export default defineComponent({
  props: {
    isShow:{
      type:Boolean,
      default:true
    }
  },
  emits: {
    "my-close": null,
  },
  setup(props, {emit}) {
    const {proxy}:any=getCurrentInstance()
    const btnclose = () => {
      emit("my-close",'传递的数据')
    }
    const btnparents=()=>{
      console.log(proxy);
      proxy.$parent.addNum()
    }
    return {
      btnclose,
      proxy,
      btnparents
    };
  },
});
</script>

<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
h3 {
  margin: 40px 0 0;
}
ul {
  list-style-type: none;
  padding: 0;
}
li {
  display: inline-block;
  margin: 0 10px;
}
a {
  color: #42b983;
}
</style>

2、父组件使用

<template>
  <HelloWorld @my-close="myModealHide" :isShow="myModalShow">solt</HelloWorld>
  <el-button @click="myModalBlock">my modal2</el-button>
  <el-button type="primary" @click="toDelit">用户详情</el-button>
</template>

<script lang="ts">
import { defineComponent, computed, onMounted, watch,ref,getCurrentInstance,reactive,nextTick ,toRefs} from 'vue'
import {
  useStore,
  mapState,
} from 'vuex'
import {useRoute,useRouter,useLink,UseLinkOptions} from "vue-router"
import { useI18n } from "vue-i18n";
import {data} from "@/utils/TypeState"
import HelloWorld from '@/components/HelloWorld.vue'
export default defineComponent({
  components:{
    HelloWorld
  },
  setup(props, context){
    console.log('context',context);
    const store=useStore()
    const {proxy}:any=getCurrentInstance()
    const number=ref<string|Number>(store.state.app.age)
    const Route=useRoute()
    const RouteLink=useLink
    const { t } = useI18n();
    const languageD=()=>{
      proxy.$i18n.locale=data.seleLanguage
    }
    console.log(store.state.app.allMenuList instanceof  Array);
    console.log(proxy);
  // 监听指定基础类型数据
    const addNum=()=>{
      //  name.value=Number(name.value) +1
      name.value++
    }
    watch(name, (now, prev) => {
          console.log(now, prev, 'count')
    })
    // 监听reactive创建的响应式变量,可以直接监听对象，必须使用内联函数
    watch(() => data.tableData, (now, prev) => {
      console.log(now, prev, 'tableData')
    })
    const myModalShow = ref(false)
    const myModealHide=(val:any)=>{
      myModalShow.value=false
      console.log(val);
    }
    const myModalBlock =()=>{
      myModalShow.value=true
    }
    const toDelit=():void=>{
      proxy.$router.push("/userAdminDetils")
    }
    return {
      age,
      number,
      proxy,
      store,
      name,
      addNum,
      ...toRefs(data) ,
      t,
      languageD,
      myModealHide,
      myModalBlock,
      myModalShow,
      toDelit
    }
  },
  created () {
    console.log(this.$route);
    console.log(this.store.state.app.age);
    // console.log(this.$store);//报错
  }
})
</script>

<style>

</style>