我正在創(chuàng)建一個(gè) REACT 組件，該組件通過基本上獲取用戶的輸入并使用簡單的鍵值對(duì)訪問翻譯來“翻譯”一個(gè)數(shù)字。除了我的 handleTranslate 方法外，一切正常。此方法的控制臺(tái)日志給我未定義。class MyComponent extends React.Component {  constructor(props) {    super(props);    this.state = {      input: '',      one: 'uno',      two: 'dos',      three: 'tres',      four: 'cuatro',      five: 'cinco',      six: 'seis',      seven: 'siete',      eight: 'ocho',      nine: 'nueve',      ten: 'diez',      answer: ''    };    this.handleChange = this.handleChange.bind(this);    this.handleTranslate = this.handleTranslate.bind(this);  };    handleChange(state) {    this.setState({      input: event.target.value    });  }  handleTranslate (state) {    var x = state.input;    this.setState({      answer: state.x    });  }    render () {  return(  <div>      <h3>Enter an English number between one and ten and watch the translation render below</h3>      <input value={this.state.value} onChange={this.handleChange, this.handleTranslate}/>      <p>{this.state.input}</p>  </div>  );  }};ReactDOM.render(<MyComponent/>, document.getElementById('view'));<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.6.3/umd/react.production.min.js"></script><script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.6.3/umd/react-dom.production.min.js"></script><div id='view' />