先行知识

• 【vue】导入组件
• 【vue】defineProps 传数据 父传子

传值流程

App.vue

<template>
  <Header @getWeb="emitsGetWeb" @userAdd="emitsUserAdd"/>
  <hr />
  <p>web.name: {{ web.name }}</p>
  <p>web.url: {{ web.url }}</p>
  <p>user: {{ user }}</p>
</template>

<script setup>
import { ref, reactive } from "vue";
import Header from "./components/Header.vue";

//响应式数据
const web = reactive({
  name: "1234567890",
  url: "https://www.1234567890.com",
});
let user = ref(0);

const emitsGetWeb = (data) => { 
  console.log(data);
  web.name = data.name;
  web.url = data.url;
}
const emitsUserAdd = (data) => {
  console.log(data);
  user.value += data;
  console.log(user.value);
}
</script>

<style lang="scss" scoped></style>

Header.vue

<template>
    <h2>header</h2>
    <button @click="userAdd">添加用户</button>
</template>

<script setup>

const emits = defineEmits(['getWeb', "userAdd"])

emits("getWeb", { name: "Header Name" , url: "Header Url"})

const userAdd = () => {
    emits("userAdd",1)
}
</script>

<style lang="scss" scoped></style>

参考

https://www.bilibili.com/video/BV1nV411Q7RX