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TypeError:在createElement上未定义React对象

我是新来的React,并Material UI和我试图创建一个AppBarTabs儿童.我目前的实现如下:

import {React, PropTypes, Component} from 'react';
import TodoTextInput from './TodoTextInput';
import injectTapEventPlugin from 'react-tap-event-plugin';
import baseTheme from 'material-ui/styles/baseThemes/lightBaseTheme'
import getMuiTheme from 'material-ui/styles/getMuiTheme'
import {Tabs, Tab} from 'material-ui/Tabs';
import {AppBar} from 'material-ui/AppBar';

const styles = {
  headline: {
    fontSize: 24,
    paddingTop: 16,
    marginBottom: 12,
    fontWeight: 400
  }
};

function handleActive(tab) {
  alert(`A tab with this route property ${tab.props['data-route']} was activated.`);
}
const defaultStyle = {
  marginLeft: 20
};

class Header extends …
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javascript tabs appbar reactjs material-ui

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appbar ×1

javascript ×1

material-ui ×1

reactjs ×1

tabs ×1