//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>) 
const songs=[
    {id:1,name:"geyao"},
    {id:2,name:"fangfang"},
    {id:1,name:"nannan"}
]
const isLoading=true
const lodingData=()=>{
    if(isLoading){
        return <div>loading...</div>
    }
    return <div>数据加载完成，此处显示加载后的数据</div>
}
const list=(
    <ul>
        {songs.map(item=>(<li key={item.id}>{item.name}</li>))}
    </ul>
)
const title=(
    <div>
        条件渲染:
        {lodingData()}
        {list}
    </div>
)
//第二步渲染React元素
ReactDOM.render(title,document.getElementById("root"))