vue3父子组件相互调用方法详解

<template>
	<child @sayHello="handle" />
</template>
 
<script setup>
	import Child from './components/child.vue';
	const handle = () => {
		console.log('子组件挪用了女组件的办法')
	}
</script>

<template>
	<view>尔是子组件</view>
	<button @click="sayHello">挪用女组件的办法</button>
</template>
 
<script setup>
	const emit = defineEmits(["sayHello"])
	const sayHello = () => {
		emit('Hello World')
	}
</script>

<template>
	<div>尔是子组件</div>
</template>
 
<script setup>
// 第一步：界说子组件的办法
const sayHello = (value) => {
	console.log(value)
}
// 第两部：袒露法子
defineExpose({
	sayHello 
})
</script>

<template>
	<button @click="getChild">触领子组件法子</button>
	<child ref="childRef" />
</template>
<script setup>
import Child from './components/child.vue'
// 界说取 ref 异名变质
const childRef = ref(null)
const getChild = () => {
	// 挪用子组件的办法或者者变质，经由过程value
	childRef.value.hello("hello world！");
}
</script>

 
<template>
  <div class="itxst">
    <!-- 利用 ref  号召 -->
    <child ref="childComp"/>
    <button @click="onClick">点击试一试</button>
  </div>
</template>
<script >
import child from "./child.vue";
export default {
  name: "app",
  //注册组件
  components: {
    child,
  },
  methods: {
    onClick: function () {
      //猎取到 子组件的  数据
      let msg = this.$refs.childComp.title;
      //执止了子组件的 play办法
      this.$refs.childComp.play();
    },
  },
};
</script> 

 
<template>
  <div class="itxst">
    {{ title }}
  </div>
</template>
<script>
//选项式默许当前真例是全数表露
export default {
  name: "demo",
  //默许全数裸露 也能够经由过程expose节制这些须要表露
  //expose: ['play'],
  data() {
    return {
      title: "www.itxst.com",
    };
  },
  methods: {
    play: function () {
      this.title = "您挪用了子组件的办法";
    },
  },
};
</script>