javascript - 类型错误 : Super expression must either be null or a function, 未定义

Question

我对 react 组件和 Prop 有疑问。下面是异常(exception)。 我做错了什么？

Uncaught TypeError: Super expression must either be null or a function, not undefined

class Component extends React.component {
  constructor(props) {
    super(props);
    this.state = {
      name: ''
    }
    this.handleChange = this.handleChange.bind(this);
  }

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

  render() {
    return (
      <div>
        <input type="text" onChange={this.handleChange} />
        <p>{this.state.name}</p>
      </div>
    )
  }
};

ReactDOM.render(
  <Component />,
  document.getElementById('reactContainer')
)

Codepen link

Answer 1

问题出在这一行:

class Component extends React.component {

您在 React.component 中使用了小型 c 而不是使用 C:

class Component extends React.Component {

检查工作代码:

class Component extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      name: ''
    }
    this.handleChange = this.handleChange.bind(this);
  }

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

  render() {
    return (
      <div>
        <input type="text" onChange={this.handleChange} />
        <p>{this.state.name}</p>
      </div>
    )
  }
};

ReactDOM.render(
  <Component />,
  document.getElementById('reactContainer')
)

<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='reactContainer'></div>