刚接触react，引入了material-ui一直报错，请前辈们指点一下

Question

App.js 引入了 一个子组件 SnackbarExampleSimple

import React from 'react';
import ReactDOM from 'react-dom';
import SnackbarExampleSimple from './Header'


  const App = () => (

    <div>
       {/* <Header/> */}
       <SnackbarExampleSimple/>
    </div>
   );
export default App;

Header.js,里面代码基本上是复制的官网实例

import React from 'react';
// import ReactDOM from 'react-dom';
// import './css/header.css';

import Snackbar from 'material-ui/Snackbar';
import RaisedButton from 'material-ui/RaisedButton';

export default class SnackbarExampleSimple extends React.Component {

  constructor(props) {
    super(props);
    this.state = {
      open: false,
    };
  }

  handleClick = () => {
    this.setState({
      open: true,
    });
  };

  handleRequestClose = () => {
    this.setState({
      open: false,
    });
  };

  render() {
    return (
      <div>
        <RaisedButton
          onClick={this.handleClick}
          label="Add to my calendar"
        />
        <Snackbar
          open={this.state.open}
          message="Event added to your calendar"
          autoHideDuration={4000}
          onRequestClose={this.handleRequestClose}
        />
      </div>
    );
  }
}

报错一堆

Answer 1

我也再用这个，这个是你没有引入css,
正确的引入方法

import MuiThemeProvider from 'material-ui/styles/MuiThemeProvider'; //就是它
import Toggle from 'material-ui/Toggle';

<MuiThemeProvider>
    <Toggle
        defaultToggled={mycheck}
        style={styles.toggle}
        trackSwitchedStyle={{backgroundColor:"#4A8EF2"}}
        thumbStyle={styles.thumbStyle}
        thumbSwitchedStyle={styles.thumbStyle}
        onToggle={this.switchState}
        />
</MuiThemeProvider>

Answer 2

material-ui是不是在初始化要设置一下样式呢。

Answer 3

答案在评论里