出现错误情况：Warning: Each child in an array or iterator should have a unique "key" prop. Check the render method of `SubParent`. See https://fb.me/react-warning-keys for more information.
说明在遍历数组的时候，没有指定key，解决方法：
加上key属性，并赋值，如
<tr key={tweet.id}>
render:function(){ var listItems = this.state.tweets.map(function(tweet, index) { return ( <tr key={tweet.id}> <td>{tweet.id}{index}</td> <td>{tweet.pname}</td> <td>{tweet.name}</td> <td><a href="#" >修改</a></td> </tr> ); });}