vue3 父子组件传参

父组件给子组件

子组件内容

<template>
  <div>子组件</div>
  <div> {{ title}}</div>
</template>

<script lang="ts" setup>

//接受父组件传来的数据
defineProps({
  title: {
    type: String,
    default: "我是子组件的默认数据"
  }
})

//ts中如何使用呢

</script>

<style lang="less" scoped>

</style>

父组件内容

<script setup lang="ts">
import HelloWorld from './components/HelloWorld.vue'
import ChildComponents from "./components/ChildComponents.vue";

let name = "我是父组件的数据"
</script>

<template>
  <div>父组件</div>
  <hr>
  <ChildComponents :title="name"/>
</template>

<style scoped>
.logo {
  height: 6em;
  padding: 1.5em;
  will-change: filter;
}

.logo:hover {
  filter: drop-shadow(0 0 2em #646cffaa);
}

.logo.vue:hover {
  filter: drop-shadow(0 0 2em #42b883aa);
}
</style>

那么子组件在ts中使用呢

const prop = defineProps({
  title: {
    type: String,
    default: "我是子组件的默认数据"
  }
})
console.log(prop.title)

子组件给父组件

子组件代码

<template>
  <div>子组件</div>
  <div> {{ title }}</div>
  <div> {{ arr }}</div>
  <button @click="send">给父组件传值</button>
</template>

<script lang="ts" setup>

//接受父组件传来的数据
//ts中如何使用呢

const props = withDefaults(defineProps<{
  title: string;
  arr: number[];
}>(), {
  title: "我是子组件的默认数据",
  arr: () => [1, 2, 3],
});
console.log(props.title);

//给父组件传值
const emit= defineEmits(["on-click"]);

const send = () => {
  emit("on-click", "我是子组件的数据");
};


</script>

<style lang="less" scoped>

</style>

 核心在这里

//给父组件传值
const emit= defineEmits(["on-click"]);

const send = () => {
  emit("on-click", "我是子组件的数据");
};

父组件收到以后要接受

<script setup lang="ts">
import HelloWorld from './components/HelloWorld.vue'
import ChildComponents from "./components/ChildComponents.vue";

let name = "我是父组件的数据"
const getName = (name: string) => {
  console.log("===我是子组件的数据>>", name);

}
</script>

<template>
  <div>父组件</div>
  <hr>
  <ChildComponents @on-click="getName"/>
</template>

<style scoped>
.logo {
  height: 6em;
  padding: 1.5em;
  will-change: filter;
}

.logo:hover {
  filter: drop-shadow(0 0 2em #646cffaa);
}

.logo.vue:hover {
  filter: drop-shadow(0 0 2em #42b883aa);
}
</style>

核心在这里

<ChildComponents @on-click="getName"/>

const getName = (name: string) => {
  console.log("===我是子组件的数据>>", name);

}

效果在这里