react

错误提示如下：
 Only a ReactOwner can have refs. You might be adding a ref to a component that was not created inside a component's `render` method, or you have multiple copies of React loaded

 解决方法如下
 npm uninstall react react-dom
 npm install react react-dom --save

this.setState(params:{page:2});
随后使用fetch将this.state.params作为参数获取数据的时候，竟然是之前的数据

使用组件componentWillReceiveProps事件即可。
componentWillMount和componentDidMount只有在组件切换时执行，同一组件在不同参数下不会触发。
例如：http::/ireage.com/test#/list/1 变为 http::/ireage.com/test#/list/2 不触发componentWillMount和componentDidMount事件。