React循環的倆種方式

此處用的map循環,
有人會問爲什麼用map不用forEach，那你就的去看看Es6裏面這倆中循環的新特性了。

循環1

import React from 'react';
class Cty extends React.Component{
    constructor(props){
        super(props)
        this.state ={
           list:[
              { name:'志欽'},
              { name:'志剛'},
              { name:'三秀'},
              { name:'鄧哥'},
              { name:'老李'},
           ],
        }
    }
    render(){
    	//函數方法裏面寫，
        let listName = this.state.list.map((item,key) => {
            console.log(item.name)
            return(
                <p key={key}>{item.name}</p>
            )
        });
        return(
            <div>
                12122121
                <div>
                     {listName}
                </div>
              
            </div>
        )
    }
}
export default Cty;

循環2

dom裏面循環

import React from 'react';
class Cty extends React.Component{
    constructor(props){
        super(props)
        this.state ={
           list:[
              { name:'志欽'},
              { name:'志剛'},
              { name:'三秀'},
              { name:'鄧哥'},
              { name:'老李'},
           ],
        }
    }
    render(){
        return(
            <div>
                12122121
                <div>
                    {
                        this.state.list.map((item,key) => {
                            return (
                                <span>{item.name}</span>
                            )
                          })
                    }
                    
                </div>
              
            </div>
        )
    }
}
export default Cty;

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