需求描述

点击按钮用于检测鼠标是否命中按钮

代码实现

import React from 'react';
import {useState, useEffect, useRef} from 'react';// 封装一个hook用来检测当前点击事件是否在某个元素之外
function useClickOutSide(ref,cb) {useEffect(()=>{const handleClickOutside = (e) => {if(ref.current && ref.current !== e.target){cb(); }}document.addEventListener('click',handleClickOutside);return () => document.removeEventListener('click', handleClickOutside);},[cb, ref]);
}function Dialog() {const [visible, setVisible] = useState(false);const refObj = useRef(null);useClickOutSide(refObj,()=>{setVisible(false);} );return (<div><buttonref={refObj}onClick={() => {setVisible(true);}}>打开</button>{visible && <div className="dialog">我是弹框的内容</div>}</div>);
}export default Dialog;

效果

参考

React好玩的自定义hook-useClickOutSide_哔哩哔哩_bilibili