前端父子组件间事件互调

React Hooks实现

子调父的事件，子组件中通过props接受父组件传递过来的事件，子组件中触发时调用事件

父调子的事件，子组件中接受父组件的ref，并且通过useImperativeHandle给ref绑定事件，父组件中通过ref.current调用子组件中事件

import React, { useCallback, useRef, useImperativeHandle } from 'react';

const Child = ({ click, pRef }) => {
  //pRef就是父组件传过来的ref
  useImperativeHandle(pRef, () => ({
    childClick: () => {
      console.log('子组件点击事件');
    },
  }));

  return <button onClick={click}>点击</button>;
};

const Parent = () => {
  const ref = useRef();

  const parentClick = useCallback(() => {
    console.log('父组件点击事件');
  }, []);

  const onClick = useCallback(() => {
    ref.current.childClick();
  }, []);

  return (
    <div>
      <Child click={parentClick} pRef={ref} />
      <button onClick={onClick}>点击</button>
    </div>
  );
};

export default Parent;

Vue3 Composition Api实现

子调父的事件，子组件通过defineEmits声明事件，父组件中@该事件，并赋予父组件中事件。子组件中触发时调用事件

父调子的事件，子组件通过defineExpose暴露内部事件，父组件声明ref，使用ref.value调用子组件中事件

<template>
  <button @click="onClick">点击</button>
</template>

<script setup>
import { defineEmits, defineExpose } from "vue";

const emit = defineEmits(["myClick"]);

const onClick = () => {
  emit("myClick");
};

const childClick = () => {
  console.log("子组件点击事件");
};

defineExpose({ childClick });
</script>

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

<template>
  <div>
    <Child @myClick="parentClick" ref="cRef" />
    <button @click="onClick">点击</button>
  </div>
</template>

<script setup>
import { reactive, ref } from "vue";
import Child from "./Child.vue";

const cRef = ref();

const parentClick = () => {
  console.log("父组件点击事件");
};

const onClick = () => {
  cRef.value.childClick();
};
</script>

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