Vue3父子通讯方式及Vue3插槽的使用方法详解

<template>
  <div class="about">
    <h1>This is an about page</h1>
    <children :num="num" age="30"></children>
  </div>
</template>
<script>
import children from "../components/children.vue";
import { ref } from "vue";
export default {
  setup() {
    let num = ref("《nanchen》");
    return {
      num,
    };
  },
  components: {
    children,
  },
};
</script>

<template>
  <div>我是子组件 我的父组件值为：{{ yy }}</div>
</template>
 
<script>
import { ref } from "vue";
export default {
  name: "Vue3appChildren",
  props: {
    num: {
      type: Number,
    },
  },
  setup(props) {
    let yy = ref(props.num);
    return {
      yy,
    };
  },
 
  mounted() {},
 
  methods: {},
};
</script>
 
<style lang="scss" scoped>
</style>

<template>
  <div class="about">
    <h1>This is an about page</h1>
    <children :num="num" age="30" @test="showHello"></children>
  </div>
</template>
<script>
import children from "../components/children.vue";
import { ref } from "vue";
export default {
  setup() {
    let num = ref("《nanchen》");
    function showHello(value) {
      console.log(value);
    }
    return {
      num,
      showHello,
    };
  },
  components: {
    children,
  },
};
</script>

<template>
  <div @click="aboutClick">我是子组件 我的父组件值为：{{ yy }}</div>
</template>
 
<script>
import { ref } from "vue";
export default {
  name: "Vue3appChildren",
  props: {
    num: {
      type: Number,
    },
  },
  setup(props, { emit }) {
    let yy = ref(props.num);
    function aboutClick() {
      emit("test", "你好你好"); // 子传父
    }
    return {
      yy,
      aboutClick,
    };
  },
 
  mounted() {},
 
  methods: {},
};
</script>
 
<style lang="scss" scoped>
</style>

    <children :num="num" age="30" @test="showHello">
      <h1>南辰，Hello</h1>
    </children>

<template>
  <div @click="aboutClick">我是子组件 我的父组件值为：{{ yy }}</div>
  <slot></slot>
</template>

<slot name="aabb"></slot>

	<HelloWorld>
		<template v-slot:aabb>
			<span>NanChen，你好</span>
		</template>
		 <!-- <template #aabb>
			<span>NanChen，你好</span>
		</template> -->
	</HelloWorld>