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functionMyComponent(){useEffect(()=>{// 这里的代码会在组件挂载后执行,模拟componentDidMount的行为console.log('Component did mount');// 返回一个函数,在组件卸载之前执行,模拟componentWillUnmount的行为return()=>{console.log('Component will unmount');};},[]);// 传递一个空数组[]表示这个effect不依赖于props或state中的任何值,因此只运行一次return(<div>Hello, World!</div>);}
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