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<!DOCTYPE html>
<html>
​
<head>
  <meta name="description" content="debounce 饥人谷" />
  <meta charset="utf-8">
  <title>函数节流</title>
</head>
​
<body>
  <h1>函数节流</h1>
  <h1>函数节流</h1>
  <h1>函数节流</h1>
  <h1>函数节流</h1>
  <h1>函数节流</h1>
  <h1>函数节流</h1>
  <h1>函数节流</h1>
  <h1>函数节流</h1>
  <h1>函数节流</h1>
  <h1>函数节流</h1>
  <h1>函数节流</h1>
  <h1>函数节流</h1>
  <h1>函数节流</h1>
  <h1>函数节流</h1>
  <h1>函数节流</h1>
  <h1>函数节流</h1>
  <h1>函数节流</h1>
  <h1>函数节流</h1>
  <h1>函数节流</h1>
  <h1>函数节流</h1>
  <h1>函数节流</h1>
</body>
​
</html>
 
function throttle(fn, gapTime) {
  let lastTime = null
  let nowTime = null
  return function() {
    nowTime = Date.now()
    if (!lastTime || nowTime - lastTime > gapTime) {
      fn()
      lastTime = nowTime
    }
  }
}
​
function fn() {
  console.log("节流")
}
​
fn = throttle(fn, 3000)
​
document.body.onscroll = function() {
  fn()
}
Output 300px

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