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[Java教程]固定在网页顶部跟随滚动条滑动而滑动的DIV层


在一个页面放2个悬浮框,悬浮框随页面的上下滚动有上下波动的效果,最终固定在同一位置

体验效果:http://hovertree.com/texiao/jsstudy/1/

代码如下:

<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><title>JavScript页面悬浮框- 何问起</title><base target="_blank" /><style>body {height: 2000px;}#div1 {width: 100px;height: 150px;background: red;position: absolute;right: 0;top:200px;}#div2 {width: 200px;height: 200px;background: green;position: absolute;left: 0;top: 200px;}a{color:white}</style></head><body><div id="div1"><a href="http://hovertree.com">何问起</a> <a href="http://hovertree.com/texiao/">特效</a></div><div id="div2"><a href="http://hovertree.com/h/bjaf/mbrpxe4o.htm">原文</a><a href="http://hovertree.com/texiao/jsstudy/1/">效果</a></div><div id="hovertree" style="position:fixed;top:100px;left:40%;z-index:99;height:100px;width:100px;background-color:silver"></div><div>在一个页面放2个悬浮框,悬浮框随页面的上下滚动有上下波动的效果,最终固定在同一位置</div><script>var h_div1 = document.getElementById('div1'), h_div2 = document.getElementById('div2');var h_hvttop = 200;window.onscroll = function () {HoverTreeMove(h_div1, h_hvttop)HoverTreeMove(h_div2, h_hvttop)//显示信息var h_scrollTop = document.documentElement.scrollTop || document.body.scrollTop;//滚动的距离var h_hovertree = document.getElementById('hovertree'); h_hovertree.innerHTML = h_div1.offsetTop + " hovertree<br /> " + h_scrollTop + "<br />" + h_div1.style.top;};function HoverTreeMove(obj,top){var h_scrollTop = document.documentElement.scrollTop || document.body.scrollTop;//滚动的距离var h_buchang = 20;if (obj.offsetTop < h_scrollTop + top - h_buchang){obj.style.top = obj.offsetTop + h_buchang + "px";setTimeout(function () { HoverTreeMove(obj, top); }, 80);}else if (obj.offsetTop > h_scrollTop + top + h_buchang){obj.style.top = (obj.offsetTop - h_buchang) + "px";setTimeout(function () { HoverTreeMove(obj, top); }, 80);}else {obj.style.top = h_scrollTop + top + "px";}}HoverTreeMove(h_div1, 200)HoverTreeMove(h_div2, 200)</script></body></html>

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