Method constructor

demo/example/DropDownDemo.jsx:14–23

(props)

export default class DropDownDemo extends React.Component {
    constructor(props){
        super(props);
        this.state = {
            value: null,
            value1: 5,
            value2: '',
            value3: [2, 4],
            value4: [1, 3],
        };
    }

    displayChange(stat, value){
        this.setState({