```
render () {
  <input type="number" value={this.props.value} />
}
```

for example, when the original value is '.98', we need format it to '0.98'. but it is not  take effect。

```javascript
class Test extends React.Component {
 state = {
    value: '.98',
  }
 changeValue = () => {
    alert(0.98);
    this.setState({
      value: '0.98',
    });
  }

 render() {
    return <div>
      <input type="number" value={this.state.value} />
      <button onClick={this.changeValue}>changeValue</button>
    </div>;
  }
}

ReactDOM.render(<Test />, mountNode);
```



render() {
        return (
          <div>
            <input
              ref="a"
              type="radio"
              name="fruit"
              checked={true}
              onChange={emptyFunction}
            />
            A
            <input ref="b" type="radio" name="fruit" onChange={emptyFunction} />
            B
            <form>
              <input
                ref="c"
                type="radio"
                name="fruit"
                defaultChecked={true}
                onChange={emptyFunction}
              />
            </form>
          </div>
        );