本文实例讲述了JavaScript实现动画打开半透明提示层的方法。分享给大家供大家参考。具体如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312" /><title>DOM半透明提示层</title><style type="text/css">body,span,div,td{font-size:12px;line-height:1.5em;color:#849BCA;}#bodyL{float:left;width:84px;margin-right:2px;}a.od{width:80px;height:25px;line-height:25px;text-align:center;font-weight:bold;border: 2px solid #849BCA;display:block;color:#547BC9;float:left;text-decoration:none;margin-top:2px;}a.od:link{background:#EEF1F8;}a.od:visited{background:#EEF1F8;}a.od:hover{background:#EEE;}a.od:active{background:#EEE;}#fd{width:500px;height:200px;background:#EDF1F8;border: 2px solid #849BCA;margin-top:2px;margin-left:2px;float:left;overflow:hidden;position:absolute;left:0px;top:0px;cursor:move;float:left;}.content{padding:10px;}</style></head><body><div id="bodyL"><a href="#" class="od" onclick = "show('fd');return false;">[打开层]</a><a href="#" class="od" onclick = "closeed('fd');return false;">[关闭层]</a></div><div id="fd" style="display:none;filter:alpha(opacity=100);opacity:1;"><div class="content">移动层</div></div><script type="text/javascript">var prox;var proy;var proxc;var proyc;function show(id){/*--打开--*/clearInterval(prox);clearInterval(proy);clearInterval(proxc);clearInterval(proyc);var o = document.getElementById(id);o.style.display = "block";o.style.width = "1px";o.style.height = "1px";prox = setInterval(function(){openx(o,500)},10);}function openx(o,x){/*--打开x--*/var cx = parseInt(o.style.width);if(cx < x){o.style.width = (cx + Math.ceil((x-cx)/5)) +"px";}else{clearInterval(prox);proy = setInterval(function(){openy(o,200)},10);}}function openy(o,y){/*--打开y--*/var cy = parseInt(o.style.height);if(cy < y){o.style.height = (cy + Math.ceil((y-cy)/5)) +"px";}else{clearInterval(proy);}}function closeed(id){/*--关闭--*/clearInterval(prox);clearInterval(proy);clearInterval(proxc);clearInterval(proyc);var o = document.getElementById(id);if(o.style.display == "block"){proyc = setInterval(function(){closey(o)},10);}}function closey(o){/*--打开y--*/var cy = parseInt(o.style.height);if(cy > 0){o.style.height = (cy - Math.ceil(cy/5)) +"px";}else{clearInterval(proyc);proxc = setInterval(function(){closex(o)},10);}}function closex(o){/*--打开x--*/var cx = parseInt(o.style.width);if(cx > 0){o.style.width = (cx - Math.ceil(cx/5)) +"px";}else{clearInterval(proxc);o.style.display = "none";}}/*鼠标拖动*/var od = document.getElementById("fd");var dx,dy,mx,my,mouseD;var odrag;var isIE = document.all ? true : false;document.onmousedown = function(e){var e = e ? e : event;if(e.button == (document.all ? 1 : 0)){mouseD = true;}}document.onmouseup = function(){mouseD = false;odrag = "";if(isIE){od.releaseCapture();od.filters.alpha.opacity = 100;}else{window.releaseEvents(od.MOUSEMOVE);od.style.opacity = 1;}}//function readyMove(e){od.onmousedown = function(e){odrag = this;var e = e ? e : event;if(e.button == (document.all ? 1 : 0)){mx = e.clientX;my = e.clientY;od.style.left = od.offsetLeft + "px";od.style.top = od.offsetTop + "px";if(isIE){od.setCapture();od.filters.alpha.opacity = 50;}else{window.captureEvents(Event.MOUSEMOVE);od.style.opacity = 0.5;}//alert(mx);//alert(my);}}document.onmousemove = function(e){var e = e ? e : event;//alert(mrx);//alert(e.button);if(mouseD==true && odrag){var mrx = e.clientX - mx;var mry = e.clientY - my;od.style.left = parseInt(od.style.left) +mrx + "px";od.style.top = parseInt(od.style.top) + mry + "px";mx = e.clientX;my = e.clientY;}}</script><br/><div>//www.VeVB.COm/</div></body></html>希望本文所述对大家的javascript程序设计有所帮助。
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