Reactjs 我可以在类组件中使用 useState 挂钩吗

我试图解决testdome上的一个React问题.

这就是任务:

消息组件包含一个锚元素和锚下的一段.应通过使用以下逻辑单击锚点元素来切换段落的呈现:

At the start, the paragraph should not be rendered.
After a click, the paragraph should be rendered.
After another click, the paragraph should not be rendered.
Finish the Message component by implementing this logic.

这就是解决方案:

// React is loaded and is available as React and ReactDOM
// imports should NOT be used
class Message extends React.Component {
  
  constructor(props) {
    super(props);
    this.state = {
      visible: false
    };
  }
  
  clickHandler = (event) => {
    event.preventDefault();
    this.setState({
     visible: !this.state.visible   
    });
  }
  
  render() {
    return (<React.Fragment>
          <a onClick={this.clickHandler} href="#">Want to buy a new car?</a>
         { this.state.visible && <p>Call +11 22 33 44 now!</p>}
        </React.Fragment>);
  }
}

document.body.innerHTML = "<div id='root'> </div>";
  
const rootElement = document.getElementById("root");
ReactDOM.render(<Message />, rootElement);

console.log("Before click: " + rootElement.innerHTML);
document.querySelector("a").click();
console.log("After click: " + rootElement.innerHTML);

我想用useState钩子做同样的事情.这是我的代码:

// React is loaded and is available as React and ReactDOM
// imports should NOT be used
class Message extends React.Component {
  
  const [show, setShow] = useState(false);
  
  const toggleVisibility = () => {
    setShow(!show);
  }
  
  render() {
    if(show) {
       return (<React.Fragment>
          <a onClick={toggleVisibility} href="#">Want to buy a new car?</a>
          <p>Call +11 22 33 44 now!</p>
        </React.Fragment>);
  } else {
     return (<React.Fragment>
          <a onClick={toggleVisibility} href="#">Want to buy a new car?</a>
        </React.Fragment>);
  }
  }
    
}

document.body.innerHTML = "<div id='root'> </div>";
  
const rootElement = document.getElementById("root");
ReactDOM.render(<Message />, rootElement);

console.log("Before click: " + rootElement.innerHTML);
document.querySelector("a").click();
console.log("After click: " + rootElement.innerHTML);

这是输出:

Run OK, but 3 out of 3 test cases failed.

Line 5: SyntaxError: unknown: Unexpected token (5:8)

  3 | class Message extends React.Component {
  4 |   
> 5 |   const [show, setShow] = useState(false);
    |         ^
  6 |   
  7 |   const toggleVisibility = () => {
  8 |     setShow(!show);

Your score is 0% :(

为什么它不起作用？不允许在类组件中使用挂钩吗？