react-循环渲染

• map
• key

constructor(props){
    super(props)
    this.state = {
        list:[
            {
                name:'zhangsan',
                id:"1"
            },
            {
                name:'lisi',
                id:"2"
            },
            {
                name:'wangwu',
                id:"3"
            }
        ]
    }
}
render(){
    return <ul>
        {
            // key 必须，不能是index 和 random
            this.state.list.map((item,index) => <li key={item.id}>{item.name}-{index}</li>)
        }
    </ul>
}