test.json和comment.js位于同一目录下
/comment.js/

//import React, {Component} from 'react';
import React, { Component, PropTypes } from 'react';
import $ from 'jquery';
import jQuery from 'jquery';
//import CommentList from './commentList';


var url='test.json'
class Common extends Component {

    constructor(props){
        super(props)
        this.state={
     comments: [
{
    author:'lm',
    message:'hi，SS'
},
{
    author:'lmqq',
    message:'hi，SS222'
}

    ]

        }
    }
//not a function   排查this
loadData(){
    //$("#test").html("1233");
    console.log(url);
   $.ajax({
           url:url,
           dataType:"json",
           success:function(comments){
               console.log(111);
           },
           error: function(data) {
        alert('error');
    }
   })
}
componentDidMount(){
    console.log('render');
    this.loadData();
}

    render() {
        return (
        

        
common
        
        
    
        );
    }
}


class CommentList extends Component {
    render() {
        var commentsNode=this.props.comments;
        var messageList=commentsNode.map(function(item,index){
            return(
                
{item.author}:{item.message}
                )
        })
        return (
            

                
{messageList}
            

        );
    }
}


export default Common;