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