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<!DOCTYPE html>
<html>
​
<head>
  <meta name="description" content="debounce 饥人谷" />
  <meta charset="utf-8">
  <title>函数防抖</title>
</head>
​
<body>
  <h1>函数防抖</h1>
  <h1>函数防抖</h1>
  <h1>函数防抖</h1>
  <h1>函数防抖</h1>
  <h1>函数防抖</h1>
  <h1>函数防抖</h1>
  <h1>函数防抖</h1>
  <h1>函数防抖</h1>
  <h1>函数防抖</h1>
  <h1>函数防抖</h1>
  <h1>函数防抖</h1>
  <h1>函数防抖</h1>
  <h1>函数防抖</h1>
  <h1>函数防抖</h1>
  <h1>函数防抖</h1>
  <h1>函数防抖</h1>
  <h1>函数防抖</h1>
  <h1>函数防抖</h1>
  <h1>函数防抖</h1>
  <h1>函数防抖</h1>
  <h1>函数防抖</h1>
</body>
​
</html>
 
function debounce(fn, wait) {
  let timer = null
  return function() {
    if (timer) {
      clearTimeout(timer)
    }
    timer = setTimeout(() => fn.apply(this, arguments), wait)
  }
}
​
function fn() {
  console.log("防抖")
}
​
fn = debounce(fn, 1000)
​
document.body.onscroll = function() {
  fn()
}
Output

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