获取错误无法读取未定义的属性“ setState”

获取错误无法读取未定义的属性“ setState”

您应该绑定该

handleChange

函数。您收到此错误的原因是，在handleChange函数中，

this

键盘 *** 作未引用React类的上下文，因此您需要绑定该函数。

看到这个答案

why do you need to bind event handlers inReact

class HTMLEditor extends React.Component {  constructor(props) {    super(props);    this.state = {value: 'Put here HTML'};  }  handleChange = (e) =>{    this.setState({value: e.currentTarget.value});  }  render() {    return (      <div>      <textarea defaultValue={this.state.value} onChange={ this.handleChange } />        <div>{this.state.value}</div>      </div>    );  }}ReactDOM.render(  <HTMLEditor />,  document.getElementById('container'));<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script><script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script><div id="container"></div>