【vue】defineProps 传数据 父传子

先行知识

• 【vue】导入组件

传值过程

App.vue

<template>

  <Header name="1234567890" url="https://www.1234567890.com" />
  <hr>
  <!-- <Footer v-bind="propsWeb" /> -->
  <Footer :="propsWeb" />
  <hr>
  <button @click="addUser();">添加用户</button>
</template>

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

/*非响应式数据，子组件中的值不会随之变化
const propsWeb = ({
  user: 15,
  // url:"https://www.1234567890.com"
})*/
//响应式数据
const propsWeb = reactive({
  user: 15,
  // url:"https://www.1234567890.com"
})

const addUser = () => {
  propsWeb.user++;
  console.log(propsWeb.user);
}
</script>


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

Header.vue

<template>
    <h2>header</h2>
    <p>name: {{ props.name }}</p>
    <p>url: {{ props.url }}</p>
</template>

<script setup>
const props = defineProps(
    ["name", "url"]
)

</script>

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

Footer.vue

<template>
    <h2>footer</h2>
    <p>User: {{ user }}</p>
    <p>Url: {{ url }}</p>
</template>

<script setup>
const props = defineProps({
    user: Number,
    url: {
        type: String,// 这里可以设置类型
        required: true,// 这里可以设置必填项
        default: 'default url'// 这里可以设置默认值
    }
})
console.log(props.user)
console.log(props.url)
</script>

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

参考

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