如何在React项目中导入谷歌地图

我在我的项目中使用webpack和reactjs，现在我想集成google map api。首先，我在package.json文件中添加了“ react-google-maps”：“ ^ 4.9.1”。下面是我的组件类。

import React, {PropTypes, Component} from 'react';

import { GoogleMap, Marker, SearchBox } from "react-google-maps";
import shouldPureComponentUpdate from 'react-pure-render/function';

const greatPlaceStyle = {
  // initially any map object has left top corner at lat lng coordinates
  // it's on you to set object origin to 0,0 coordinates
  position: 'absolute',
  width: 512,
  height: 512,
  left: 512 / 2,
  top: 512 / 2,

  border: '5px solid #f44336',
  borderRadius: 512,
  backgroundColor: 'white',
  textAlign: 'center',
  color: '#3f51b5',
  fontSize: 16,
  fontWeight: 'bold',
  padding: 4
};

export default class SimpleMapPage extends Component {
  static defaultProps = {
    center: {lat: 59.938043, lng: 30.337157},
    zoom: 1,
    greatPlaceCoords: {lat: 59.724465, lng: 30.080121}
  };

  shouldComponentUpdate = shouldPureComponentUpdate;

  constructor(props) {
    super(props);
  }

  render() {
    return (
       <GoogleMap>

        defaultCenter={this.props.center}
        defaultZoom={this.props.zoom}>

        <MyGreatPlace lat={59.955413} lng={30.337844} text={'A'} />
        <MyGreatPlace {...this.props.greatPlaceCoords} text={'B'} />

      </GoogleMap>
    );
  }
}

export default class MyGreatPlace extends Component {
  static propTypes = {
    text: PropTypes.string
  };

  static defaultProps = {};

  //shouldComponentUpdate = shouldPureComponentUpdate;

  constructor(props) {
    super(props);
  }

  render() {
    return (
       <div style={greatPlaceStyle}>
          {this.props.text}
       </div>
    );
  }
}

在index.html文件中，添加了以下javascripts。第一个是goold map api依赖项。第二个是由webpack打包的bundle.js。当我访问我的应用程序时，没有显示谷歌地图。我认为问题将无法在我的组件类上导入google map api。导入googleapis的正确方法是什么？

<script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyA2sDQZ-36NLlY4iMvoiuQ7mS1n-v8iq2M" async defer></script>
    <script type="text/javascript" src="bundle.js" charset="utf-8"></script>