react-router4以后动态加载解决办法（code-split）

react-router都升级到5.0了，之前用的2.*，想用create-react-app新建个项目用一下

首先是react-router-redux用法变了，使用了ConnectedRouter，本以为错误在这里，折腾半天发现不是，

ReactDOM.render(
    <Provider store={store}>
        <ConnectedRouter history={history}>
           <App/>
        </ConnectedRouter>
    </Provider>,document.getElementById('root')
)

第二官方的code-split方案https://reacttraining.cn/web/...

看文档，不多说，但是，一定会遇到如下报错

Warning: React.createElement: type is invalid -- expected a string (for built-in components) or a class/function (for composite components) but got: null. Check your code at index.js:44.
    in Bundle (at index.js:43)
    in Abouts (created by Route)
    in Route (at index.js:56)
    in div (at index.js:54)
    in App (at index.js:67)
    in Router (created by ConnectedRouter)
    in ConnectedRouter (at index.js:66)
    in Provider (at index.js:65)

google了半天，
bundle.js里，render方法里，改写

render() {
    return this.props.children(this.state.mod)
  }

为：

return this.state.mod ? this.props.children(this.state.mod) : null

世界安静了

github地址：https://github.com/jiangbo201...

（编辑：李大同）

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