1const React = require('react')
2class Upload extends React.Component {
3  constructor(props){
4    super(props)
5    this.state = {
6      file: null
7    }
8    this.handleChange = this.handleChange.bind(this)
9  }
10  handleChange(event) {
11    this.setState({
12      file: URL.createObjectURL(event.target.files[0])
13    })
14  }
15  render() {
16    return (
17      <div>
18        <input type="file" onChange={this.handleChange}/>
19        <img src={this.state.file}/>
20      </div>
21    );
22  }
23}
24module.exports = Upload