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jQuery模拟窗口抖动效果

效果图:

代码如下:

<!DOCTYPE html>
<html>
<head>
 <meta charset="utf-8" />
 <title>jQuery模拟窗口抖动</title>
 <style type="text/css">
  input{margin-top: 20px;}
  .center{margin-left: 50%;transform: translate(-50%);}
  .img{display:block;position:absolute;top:100px;}
 </style>
</head>
<body>
 <img src="http://mpic.tiankong.com/60b/994/60b994dc105a7b76b25e116733a142e9/431-0248.jpg" class="img center" />
 <input type="button" class="center" value="模拟窗口抖动" />
 <script src="https://ajax.aspnetcdn.com/ajax/jQuery/jquery-3.1.0.js" type="text/javascript"></script>
 <script type="text/javascript">
  $(":button").click(function () {
   var len = 4, //晃动的距离,单位像素
   c = 16, //晃动次数,4次一圈
   step = 0, //计数器
   img = $("img"),
   off = img.offset();
   this.step = 0;
   timer = setInterval(function () {
    var set = pos();
    img.offset({ top: off.top + set.y * len, left: off.left + set.x * len });
    if (step++ >= c) {
     img.offset({ top: off.top, left: off.left }); //抖动结束回归原位
     clearInterval(timer);

    }
    // console.log(step)
   }, 45);
  });
  function pos() {
   this.step = this.step ? this.step : 0;
   this.step = this.step == 4 ? 0 : this.step;
   var set = {
    0: { x: 0, y: -1 },
    1: { x: -1, y: 0 },
    2: { x: 0, y: 1 },
    3: { x: 1, y: 0 }
   }
   return set[this.step++];
  }
 </script>
</body>
</html>

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