与ES7反应：未捕获的TypeError：无法读取未定义的属性“状态”

确保

super()

你应该设置

this

setAuthorState

class ManageAuthorPage extends Component {  state = {    author: { id: '', firstName: '', lastName: '' }  };  constructor(props) {    super(props);    this.handleAuthorChange = this.handleAuthorChange.bind(this);  }  handleAuthorChange(event) {    let {name: fieldName, value} = event.target;    this.setState({      [fieldName]: value    });  };  render() {    return (      <AuthorForm        author={this.state.author}        onChange={this.handleAuthorChange}      />    );  }}

另一种选择基于

arrow function

class ManageAuthorPage extends Component {  state = {    author: { id: '', firstName: '', lastName: '' }  };  handleAuthorChange = (event) => {    const {name: fieldName, value} = event.target;    this.setState({      [fieldName]: value    });  };  render() {    return (      <AuthorForm        author={this.state.author}        onChange={this.handleAuthorChange}      />    );  }}