Method constructor

demo/example/CheckBoxGroupDemo.jsx:15–21

(props, refs)

export default class CheckBoxGroupDemo extends React.Component {
    constructor(props, refs){
        super(props);
        this.state = {
            displayText: checkedVal.join(','),
            displayText1: checkedVal1.join(','),
        };
    }

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