//导入react
     import React from "react"
      
     import ReactDOM from "react-dom"
      
     //第一步创建jsx创建react元素
     const fangfang=<p>我是方方</p>
     const name="geyao"
     const sayHi=()=>"geyao"
     const title =(<h1>
         <p className={{color:"red"}}>hello {name}</p>
         <p>{sayHi()}</p>
         <p>{1}</p>
         {fangfang}
     </h1>)
      
     //第二步渲染React元素
     ReactDOM.render(title,document.getElementById("root"))