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用JavaScript实现的仿QQ聊天窗口，可以展开层、拖动层、关闭层，还可以简单发消息，很不错吧，而且代码也不多，适合新手研究，也比较实用，你可以在此基础上扩展很多JS+CSS应用。
<!--CTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dt--> <html> <head> <title>层展开、层拖动、层关闭</title> <meta http-equiv="mrc-type" mrc="text/html; charset=gb2312" /> <style type="text/css" media="all" rel="stylesheet"> <!-- body { text-align:left; margin:0; font:normal 12px Verdana, Arial; background:#FFEEFF } form { margin:0; font:normal 12px Verdana, Arial; } table,input { font:normal 12px Verdana, Arial; } a:link,a:visited{ text-decoration:none; color:#333333; } a:hover{ text-decoration:none; color:#FF6600 } #main { width:400px; position:absolute; left:600px; top:100px; background:#EFEFFF; text-align:left; filter:Alpha(opacity=90) } #ChatHead { text-align:right; padding:3px; border:1px solid #003399; background:#DCDCFF; font-size:11px; color:#3366FF; cursor:move; } #ChatHead a:link,#ChatHead a:visited, { font-size:14px; font-weight:bold; padding:0 3px } #ChatBody { border:1px solid #003399; border-top:none; padding:2px; } #ChatContent { height:200px; padding:6px; overflow-y:scroll; word-break: break-all } #ChatBtn { border-top:1px solid #003399; padding:2px } --> </style><script language="javascript" type="text/javascript"> <!-- function $(d){return document.getElementById(d);} function gs(d){var t=$(d);if (t){return t.style;}else{return null;}} function gs2(d,a){ if (d.currentStyle){ var curVal=d.currentStyle[a] }else{ var curVal=document.defaultView.getComputedStyle(d, null)[a] } return curVal; } function ChatHidden(){gs("ChatBody").display = "none";} function ChatShow(){gs("ChatBody").display = "";} function ChatClose(){gs("main").display = "none";} function ChatSend(obj){ var o = obj.ChatValue; if (o.value.length>0){ $("ChatContent").innerHTML += "<strong>Akon说：</strong>"+o.value+"<br/>"; o.value=''; } } if (document.getElementById){ ( function(){ if (window.opera){ document.write("<input type='hidden' id='Q' value=' '>"); } var n = 500; var dragok = false; var y,x,d,dy,dx; function move(e) { if (!e) e = window.event; if (dragok){ d.style.left = dx + e.clientX - x + "px"; d.style.top = dy + e.clientY - y + "px"; return false; } } function down(e){ if (!e) e = window.event; var temp = (typeof e.target != "undefined")?e.target:e.srcElement; if (temp.tagName != "HTML"|"BODY" && temp.className != "dragclass"){ temp = (typeof temp.parentNode != "undefined")?temp.parentNode:temp.parentElement; } if('TR'==temp.tagName){ temp = (typeof temp.parentNode != "undefined")?temp.parentNode:temp.parentElement; temp = (typeof temp.parentNode != "undefined")?temp.parentNode:temp.parentElement; temp = (typeof temp.parentNode != "undefined")?temp.parentNode:temp.parentElement; } if (temp.className == "dragclass"){ if (window.opera){ document.getElementById("Q").focus(); } dragok = true; temp.style.zIndex = n++; d = temp; dx = parseInt(gs2(temp,"left"))|0; dy = parseInt(gs2(temp,"top"))|0; x = e.clientX; y = e.clientY; document.onmousemove = move; return false; } } function up(){ dragok = false; document.onmousemove = null; } document.onmousedown = down; document.onmouseup = up; } )(); } --> </script> </head> <body> <div class="dragclass" id="main" style="LEFT: 588px; TOP: 298px"> <div id="ChatHead"><a onclick="ChatHidden();" href="#">-</a> <a onclick="ChatShow();" href="#">+</a> <a onclick="ChatClose();" href="http://mb5u.com">x</a> </div> <div id="ChatBody"> <div id="ChatContent"></div> <div id="ChatBtn"> <form action="" method="post" name="chat"> <textarea style="WIDTH: 350px" rows="3" name="ChatValue"></textarea> <input onclick="ChatSend(this.form);" type="button" name="Submit" value="Chat" /> </form> </div> </div> </div> </body> </html>