摘要：
<div class="con"> <img src="../img/jiaoyue.png" /><span>I am very good</span> </div> 底下会有空白，因为行内块状元素默认是以文字的基线对齐的， 解决方案有两个 1. .con{ border:1px solid re 阅读全文
摘要：
import React, {useState,memo,useCallback,useMemo} from 'react'; import ReactDOM from 'react-dom'; let ChildComp = ({info,changeStr})=>{ console.log(11 阅读全文