在react中封装一个简单的自定义hook

// 创建自定义 hook，实现鼠标位置状态逻辑复用
const useMouse = () => {
  const [position, setPosition] = useState({ x: 0, y: 0 })
  
  useEffect(() => {
    const onMouseMove = e => {
      const { pageX, pageY } = e
      setPosition({
        x: pageX,
        y: pageY
      })
    }
    
    window.addEventListener('mousemove', onMouseMove)
    return () => window.removeEventListener('mousemove', onMouseMove)
  }, [])
  
  return position
}

// 复用：
const Cat = () => {
  const { x, y } = useMouse()
  return (
  	<img
      src={catImg}
      style={{
        position: 'absolute',
        top: y,
        left: x
      }}
      alt=""
    />
  )
}

const Position = () => {
  const { x, y } = useMouse()
  return (
    <div>鼠标当前位置：(x: {x}, y: {y})</div>
  )
}
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