节流 频繁触发事件只执行一次 必须要等当前事件结束了 才能被再次触发 

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>节流</title>
</head>

<body>
  <input type="text" placeholder="鼠标反复经过我">
</body>
<script>
  // 节流主要运用于快速点击,鼠标滑动,鼠标滚轮滚动,下拉加载发请求等

  let timer = null
  let input = document.querySelector('input')
  input.addEventListener('mouseover', function () {
    if (timer != null) {
      return
    }

    timer = setTimeout(() => {
      console.log("节流")
      timer = null
    }, 500)

  })

</script>

</html>
posted @ 2023-01-08 14:46  你笑的好瓜  阅读(101)  评论(0)    收藏  举报