javascript 返回顶部

2022-04-21 12:11:50

<style>

#linGoTopBtn {
   POSITION: fixed; TEXT-ALIGN: center; LINE-HEIGHT: 30px; WIDTH: 30px; BOTTOM: 35px; HEIGHT: 33px; FONT-SIZE: 12px; CURSOR: pointer; RIGHT: 0px;
}
</style>

<script>
function linGoTop()
{
   var obj = document.getElementById("linGoTopBtn");
   function getScrollTop()
   {
       return document.documentElement.scrollTop;
   }

   function setScrollTop(value)
   {
       document.documentElement.scrollTop ? document.documentElement.scrollTop = value : document.body.scrollTop = value;
   }

   window.onscroll = function()
   {
       getScrollTop() > 0 ? obj.style.display =‘‘ : obj.style.display = ‘none‘;

   }

   obj.onclick = function()
   {
       var goTop = setInterval(scrollMove, 5); // 单位毫秒
       function scrollMove()
       {

           setScrollTop(getScrollTop()/1.1);
           if(getScrollTop() < 1) clearInterval(goTop);
       }
   }

}
</script>
</head>

<body style="text-align:center">

<DIV style="DISPLAY: none" id="linGoTopBtn"><IMG border=0 src="images/top.jpg"></DIV>
<SCRIPT type="text/javascript">linGoTop();</SCRIPT>

</body>
</html>

javascript 返回顶部,布布扣,bubuko.com

javascript 返回顶部