js节流函数高级版

节流函数其主要作用就是防止用户在短时间内多次触发该事件。

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

<head>
  <meta charset="UTF-8">
  <title>Document</title>
</head>

<body><script>
  function throttle(fn, delay, duration) {
    var timer = null,
      begin = new Date();
    return function() {
      var context = this,
        args = arguments,
        current = new Date();
      clearTimeout(timer);
      if (current - begin >= duration) {
        fn.apply(context, args);
        begin = current;
      } else {
        timer = setTimeout(function() {
          fn.apply(context, args);
        }, delay)
      }
    }
  };

  function demo() {
    console.log(1)
  }
  /*参数说明：第一个参数是要执行的函数，第二个参数是说在500毫秒内连续触发了该函数只执行一次，第三个参数是说每隔200毫秒自动执行一次该函数*/
  window.onresize = throttle(demo, 500, 200)
  </script>
</body>

</html>

 简单高效的方法：

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

<head>
  <meta charset="UTF-8">
  <title>Document</title>
</head>

<body>
  <script>
  function throttle(method, context) {
    clearTimeout(method.tId);
    method.tId = setTimeout(function() {
      method.call(context);
    }, 300);
  };

  function demo() {
    console.log(1)
  }
  window.onresize = function(){
throttle(demo, window)
}
  </script>
</body>

</html>

 

posted @ 2017-04-12 22:54  wmui  阅读(733)  评论(0)  编辑  收藏  举报