答案： <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>runcode</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta name="Author" content="Sheneyan" /> <script type="text/javascript"> var mh = 30;//最小高度 var step = 1;//每次变化的px量 var ms = 10;//每隔多久循环一次 function toggle(o){ if (!o.tid)o.tid = "_" + Math.random() * 100; if (!window.toggler)window.toggler = {}; if (!window.toggler[o.tid]){ window.toggler[o.tid]={ obj:o, maxHeight:o.offsetHeight, minHeight:mh, timer:null, action:1 }; } o.style.height = o.offsetHeight + "px"; if (window.toggler[o.tid].timer)clearTimeout(window.toggler[o.tid].timer); window.toggler[o.tid].action *= -1; window.toggler[o.tid].timer = setTimeout("anim('"+o.tid+"')",ms ); } function anim(id){ var t = window.toggler[id]; var o = window.toggler[id].obj; if (t.action < 0){ if (o.offsetHeight <= t.minHeight){ clearTimeout(t.timer); return; } } else{ if (o.offsetHeight >= t.maxHeight){ clearTimeout(t.timer); return; } } o.style.height = (parseInt(o.style.height, 10) + t.action * step) + "px"; window.toggler[id].timer = setTimeout("anim('"+id+"')",ms ); } </script> <style type="text/css"> div.xx{border:solid 1px;overflow:hidden;} div.xx h5{border:solid 1px;border-width:0 0 1px;padding:0;margin:0;height:30px;line-height:30px;cursor:pointer;background:#eee;} </style> </head> <body> <div class="xx"><h5 onclick="toggle(this.parentNode)">伸缩效果</h5> <p>内容</p> <p>内容</p> <p>内容</p> <p>内容</p> </div> <div class="xx"><h5 onclick="toggle(this.parentNode)">伸缩效果</h5> <p>sdf容</p> <p>sdf容</p> <p>sf容</p> <p>sfd容</p> </div> </body> </html> [Ctrl+A 全选 注:如需引入外部Js需刷新才能执行]一打开网页是收缩的 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>runcode</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta name="Author" content="Sheneyan" /> <script type="text/javascript"> var mh = 30;//最小高度 var step = 1;//每次变化的px量 var ms = 10;//每隔多久循环一次 var caiying2007=202//最大高度 window.onload=function init(){ var obj_init=document.getElementsByTagName("div") for (var oi=0;oi<obj_init.length;oi++){ if (obj_init[oi].className=="xx"){obj_init[oi].style.height=mh + "px";} } } function toggle(o){ if (!o.tid)o.tid = "_" + Math.random() * 100; if (!window.toggler)window.toggler = {}; if (!window.toggler[o.tid]){ window.toggler[o.tid]={ obj:o, // maxHeight:o.offsetHeight, maxHeight:caiying2007, minHeight:mh, timer:null, action:-1 }; } o.style.height = o.offsetHeight + "px"; if (window.toggler[o.tid].timer)clearTimeout(window.toggler[o.tid].timer); window.toggler[o.tid].action *= -1; window.toggler[o.tid].timer = setTimeout("anim('"+o.tid+"')",ms ); } function anim(id){ var t = window.toggler[id]; var o = window.toggler[id].obj; if (t.action < 0){ if (o.offsetHeight <= t.minHeight){ clearTimeout(t.timer); return; } } else{ if (o.offsetHeight >= t.maxHeight){ clearTimeout(t.timer); return; } } o.style.height = (parseInt(o.style.height, 10) + t.action * step) + "px"; window.toggler[id].timer = setTimeout("anim('"+id+"')",ms ); } </script> <style type="text/css"> div.xx{border:solid 1px;overflow:hidden;height:200px} div.xx h5{border:solid 1px;border-width:0 0 1px;padding:0;margin:0;height:30px;line-height:30px;cursor:pointer;background:#eee;} </style> </head> <body> <div class="xx"><h5 onclick="toggle(this.parentNode);" >伸缩效果</h5> <p>内容</p> <p>内容</p> <p>内容</p> <p>内容</p> </div> <div class="xx"><h5 onclick="toggle(this.parentNode)">伸缩效果</h5> <p>sdf容</p> <p>sdf容</p> <p>sf容</p> <p>sfd容</p> </div> <script> </script> </body> </html> [Ctrl+A 全选 注:如需引入外部Js需刷新才能执行]慢慢展开菜单的效果，以前早就有人做过，给个时间函数。也算不上什么极限： <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <style> body{ margin:0px; font:normal 12px 宋体; background: #999999; } table{border:0px;} td{font:normal 12px 宋体; } img{vertical-align:middle; border:0px;} .sec_menu{border-left:1px solid #808080; border-right:1px solid #808080; border-bottom:1px solid #808080; overflow:hidden; background:#FFCC99;} .menu_title{background-color: #CC6600} .menu_title span{color:#FFFFFF;} .menu_title2{background-color: #FF9900} .menu_title2 span{color:#C8C8C8; } .showtitle{position:relative; top:-2px; left:-6px; border:1pt solid #C3D4E7; z-index:0; height:26; background-color: #0080C0; padding-top:5; padding-left:5} .alp{FILTER: alpha(opacity=0,finishopacity=100,style=1,startx=0,starty=5, finishx=250,finishy=85} .txt1{font-size:9pt; color:#CCCCCC;} </style> <SCRIPT LANGUAGE="JavaScript"> <!-- function menuShow(MenuId,maxh,MenuId2,arrow){ if(MenuId.style.pixelHeight<maxh) { MenuId.style.pixelHeight+=maxh/20; MenuId.filters.alpha.opacity+=5; arrow.innerHTML="<FONT face=webdings>6</span>" if(MenuId.style.pixelHeight==maxh/10) MenuId.style.display="block"; myMenuId=MenuId; myMaxh=maxh; myMenuId2=MenuId2; myarrow=arrow setTimeout("menuShow(myMenuId,myMaxh,myMenuId2,myarrow)","5"); } } function menuHide(MenuId,maxh,MenuId2,arrow){ if(MenuId.style.pixelHeight>0) { if(MenuId.style.pixelHeight==maxh/20) MenuId.style.display="none"; MenuId.style.pixelHeight-=maxh/20; MenuId.filters.alpha.opacity-=5; arrow.innerHTML="<FONT face=webdings>4</span>" myMenuId=MenuId; myMaxh=maxh myMenuId2=MenuId2; myarrow=arrow setTimeout("menuHide(myMenuId,myMaxh,myMenuId2,myarrow)","5"); } else if(whichContinue) whichContinue.click(); } function menuChange(MenuId,maxh,MenuId2,arrow){ if(MenuId.style.pixelHeight){ menuHide(MenuId,maxh,MenuId2,arrow); whichOpen=""; whichcontinue=""; } else if(whichOpen) { whichContinue=MenuId2; whichOpen.click(); } else { menuShow(MenuId,maxh,MenuId2,arrow); whichOpen=MenuId2; whichContinue=""; } } function MM_preloadImages() { //v3.0 var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array(); var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i </SCRIPT> <title>Cattom</title> <link href=> </head> <script language="JavaScript"> nereidFadeObjects = new Object(); nereidFadeTimers = new Object(); function nereidFade(object, destOp, rate, delta){ if (!document.all) return if (object != "[object]"){ //提取串值 setTimeout("nereidFade("+object+","+destOp+","+rate+","+delta+")",0); return; } clearTimeout(nereidFadeTimers[object.sourceIndex]); diff = destOp-object.filters.alpha.opacity; direction = 1; if (object.filters.alpha.opacity > destOp){ direction = -1; } delta=Math.min(direction*diff,delta); </pre><p>上一个：<a href="/show/e572cd17f2b7ba5a.htm">javascript 如何生成不重复的随机数</a><br/>下一个：<a href="/show/11505102be5da952.htm">Auntion-TableSort javascript类文件第1/2页</a></p><div class="piclist">更多图片编程知识:<ul><li><a href="/show/8b6a4987c36b9fec.htm"><img src='/upload/2013111604/20130311025822643.png' width=105 height=105><br/>JSP原理笔记（二）</a></li><li><a href="/show/09fcf25e402fd444.htm"><img src='/upload/20121013/qq_logo.gif' width=105 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