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CodeReview: 在组件卸载时清除你的定时器

代码: code

  React.useEffect(() => {
    setTimeout(() => {  /// <=== ! ! !你的定时器未清除, 这个东西应该能加lint查出来
      setOpacity(1)
    }, 500)
  }, [])

我觉得应该改成这样

  const timer = React.useRef<number | null>(null)
  React.useEffect(() => {
    timer.current = setTimeout(() => {
      setOpacity(1)
    }, 500)
    return () => {
      if (timer.current !== null) {
        clearTimeout(timer.current)
      }
    }
  }, [])

按道理来说这个东西应该在React Strict Mode下会报警

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