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JS缓冲运动案例：右侧居中悬浮窗
拾一枝樱花的博客
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391 people have browsed it
  1. <!DOCTYPE html>
  2. <html lang="zh-CN">
  3. <head>
  4.   <meta charset="UTF-8">
  5.   <title>JS小案例：右侧缓冲悬浮框</title>
  6.   <style>
  7.     body {
  8.       height: 2000px;
  9.       margin: 0px;
  10.     }
  11.     #div1 {
  12.       width: 100px;
  13.       height: 150px;
  14.       background: red;
  15.       position: absolute;
  16.       right: 0;
  17.       bottom:calc(50% - 75px);
  18.     }
  19.   </style>
  20.   <script>
  21.     window.onscroll = function () {
  22.       startMove();
  23.     }
  24.     var timer = null;
  25.     function startMove() {
  26.       var oDiv = document.getElementById('div1');
  27.       clearInterval(timer);
  28.       timer = setInterval(function () {
  29.         var scrollTop = document.documentElement.scrollTop || document.body.scrollTop;
  30.         var iTarget = (document.documentElement.clientHeight - oDiv.offsetHeight) / 2 + scrollTop;
  31.         iTarget = Math.ceil(iTarget);
  32.         var speed = (iTarget - oDiv.offsetTop) / 4;
  33.         speed = speed > 0 ? Math.ceil(speed) : Math.floor(speed);
  34.         if (oDiv.offsetTop == iTarget) {
  35.           clearInterval(timer);
  36.         } else {
  37.           oDiv.style.top = oDiv.offsetTop + speed + 'px';
  38.         }
  39.       }, 30)
  40.     }
  41.   </script>
  42. </head>
  43. <body>
  44.   <div id='div1'></div>
  45. </body>
  46. </html>
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