class Demo extends React.Component {
 
    constructor(props) {
        super(props);
        this.state = {
            number: ''
        }
    }
 
    handleChange(newValue) {
        this.setState({
            number: newValue
        });
    }
 
    render() {
        var t = this;
        return (
            <NumberField label="金额" placeholder="请输入"
             value={t.state.number}
             onChange={t.handleChange.bind(t)}/>
        );
    }
};