react表单提交

class FlavorForm extends React.Component {
  constructor(props) {
    super(props);
    this.state = {value: 'coconut'};

    this.handleChange = this.handleChange.bind(this);
    this.handleSubmit = this.handleSubmit.bind(this);
  }

  handleChange(event) {
    this.setState({value: event.target.value});
  }

  handleSubmit(event) {
    alert('Your favorite flavor is: ' + this.state.value);
    event.preventDefault();
  }

  render() {
    return (
      <form onSubmit={this.handleSubmit}>
        <label>
          Pick your favorite La Croix flavor:
          <select value={this.state.value} onChange={this.handleChange}>
            <option value="grapefruit">Grapefruit</option>
            <option value="lime">Lime</option>
            <option value="coconut">Coconut</option>
            <option value="mango">Mango</option>
          </select>
        </label>
        <label>
          <input value={this.state.value} onChange={this.handleChange}/>
        </label>
        <label>
          <textarea value={this.state.value} onChange={this.handleChange}/>
        </label>
        <input type="submit" value="Submit" />
      </form>
    );
  }
}

ReactDOM.render(
  <FlavorForm />,
  document.getElementById('root')
);

class MutilForm extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      nums: '',
      isGoing: true
    };
    this.handleChange = this.handleChange.bind(this);
  }
  handleChange(e) {
    const target = e.target;
    const value = target.type === 'checkbox'? target.checked: target.value;
    const name = target.name;
    this.setState({
      [name]: value
    });
    console.log(value);
  }
  render() {
    return (
      <form>
      <label>
        <input type='text' name='nums' onChange={this.handleChange} value={this.state.nums}/>
      </label>
        <br/>
       <label>
        <input type='checkbox' name='isGoing' onChange={this.handleChange} value={this.state.isGoing}/>
       </label>
      </form>
    );
  }
}
let root = document.getElementById('root');
ReactDOM.render(<MutilForm/>,root);