以前看过几个JS代码格式的，自己也来写了一个，呵呵，优点是可以处理超长的 JS 而不会死机.........
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运行代码框
<html><br/><br/><br/><head><br/><br/><br/><title>JSer </title><br/><br/><br/><meta http-equiv="content-type" content="text/html; charset=gb2312" /><br/><br/><br/><style><br/><br/><br/>/* Global CSS */<br/><br/><br/><br/><br/><br/>* { padding:0px; margin:0px; font-size:13px; font-family: arial 宋体; }<br/><br/><br/><br/><br/><br/>body { overflow:auto; border:0px none black; background-color:buttonface; }<br/><br/><br/><br/><br/><br/>li { margin:0px 0px 0px 40px; padding:2px 4px; }<br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/>/* Class CSS */<br/><br/><br/><br/><br/><br/>.quote { color:#999; }<br/><br/><br/>.comments { color: #009090; }<br/><br/><br/>.indent { margin-left:25px; }<br/><br/><br/>.regexp { color:#F000F0; }<br/><br/><br/><br/><br/><br/>/* Identified CSS */<br/><br/><br/><br/><br/><br/>#divTools { height:20px; border-bottom:1px solid #555; padding-left:15px; }<br/><br/><br/><br/><br/><br/>#divTools a { color:navy; text-decoration:none; height:20px; line-height:20px; padding:0px 25px; }<br/><br/><br/><br/><br/><br/>#divTools a:hover { color:white; background-color:navy; text-decoration:none; height:20px; line-height:20px; }<br/><br/><br/><br/><br/><br/>#divJSInput { display:none; width:600px; height:450px; border:2px outset buttonface; position:absolute; background-color:buttonface; z-Index:2; }<br/><br/><br/><br/><br/><br/>#divJSInputTitle { color:white; background-color:navy; height:20px; line-height:20px; padding:0px 10px; cursor:default; }<br/><br/><br/><br/><br/><br/>#txtJSInput { width:598px; height:406px; overflow:auto; padding:4px 8px; background-color:white;}<br/><br/><br/><br/><br/><br/>#divJSInputBar { height:24px; padding:0px 4px; }<br/><br/><br/><br/><br/><br/>#divJSInputBar input { width:110px; height:22px; border:1px solid #555; line-height:20px; }<br/><br/><br/><br/><br/><br/>#divJSOutput { background-color:white; border:1px inset buttonface; width:100%; height:500px; overflow:auto; }<br/><br/><br/><br/><br/><br/>#divWaiting { display:none; width:400px; height:60px; border:1px solid buttonface; position:absolute; background-color:#E0F0F0; z-Index:3; text-align:center; padding-top:10px; }<br/><br/><br/><br/><br/><br/>#divWaiting input { width:140px; height:22px; border:1px solid #555; line-height:20px; cursor:default; margin-top:4px; }<br/><br/><br/><br/><br/><br/></style><br/><br/><br/><br/><br/><br/><br/><br/></head><br/><br/><br/><body><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><a href="#" onclick="return(showJSInput());">Input JS</a><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/>Please Input the js:<br/><br/><br/><br/><br/><textarea id="txtJSInput">document.write('<script type="text/javascript" src="/js/flashobject.js"></scr'+'ipt>');function runCode(){if(1==arguments.length)try{event=arguments[0];};catch(e){};var code=(event.target||event.srcElement).parentNode.childNodes[0].value;var newwin=window.open('','','');newwin.opener=nullnewwin.document.write(code);newwin.document.close();};function MM_findObj(n,d){var p,i,x;if(!d)d=document;if((p=n.indexOf("?"))>0&&parent.frames.length){d=parent.frames[n.substring(p+1)].document;n=n.substring(0,p);};if(!(x=d[n])&&d.all)x=d.all[n];for(i=0;!x&&i<d.forms.length;i++)x=d.forms[i][n];for(i=0;!x&&d.layers&&i<d.layers.length;i++)x=MM_findObj(n,d.layers[i].document);if(!x&&d.getElementById)x=d.getElementById(n);return x;};function MM_showHideLayers(){var i,p,v,obj,args=MM_showHideLayers.arguments;for(i=0;i<(args.length-2);i+=3)if((obj=MM_findObj(args[i]))!=null){v=args[i+2];if(obj.style){obj=obj.style;v=(v=='show')?'visible':(v='hide')?'hidden':v;};obj.visibility=v;};};function ADBanner(){this.htmlcode="";this.href="";this.imgsrc="";this.imgwidth="";this.imgheight="";this.imgalt="";this.imgborder="";this.weight=1;this.place=1this.type=1;this.id=0;};function CreatBanners(aBanners,aNum){for(var i=0;i<aNum;i++){aBanners[i]=new ADBanner();};};function showbanner(aPlace,aType,aBannerID){var amount=ADBanners.length;var includeList=new Array(amount);if(!document.usedBanners){document.usedBanners=new Array(amount);for(var i=0;i<amount;i++)document.usedBanners[i]=-1;};var usedList=document.usedBanners;if(arguments.length==2){var j=0;var sum=0;for(var i=0;i<amount;i++){if(ADBanners[i].place==aPlace&&ADBanners[i].type==aType){if(usedList[i]!=i){includeList[j]=i;j++;sum=sum+ADBanners[i].weight;};};};if(sum<=0)return ;var rndNum=Math.round(Math.random()*sum);i=0;j=0;while(true){j=j+ADBanners[includeList[i]].weight;if(j>=rndNum)break;i++;};i=includeList[i];};else {if(aBannerID>=0&&aBannerID<amount)i=aBannerID;else return ;};usedList[i]=i;if(ADBanners[i].htmlcode=="")document.write('<A HREF="'+ADBanners[i].href+'" target=_blank><img SRC="'+ADBanners[i].imgsrc+'" WIDTH="'+ADBanners[i].imgwidth+'" HEIGHT="'+ADBanners[i].imgheight+'" ALT="'+ADBanners[i].imgalt+'" BORDER="'+ADBanners[i].imgborder+'"></A>');else document.write(ADBanners[i].htmlcode);document.write('<script src=/common/jsbanner/redirect.asp?action=visit&id='+ADBanners[i].id+' ></s'+'cript>')};var ADBanners=new Array();CreatBanners(ADBanners,9);ADBanners[0].htmlcode='<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=5,0,0,0" width="533" height="104"><param name=movie value="http://gg.blueidea.com/2005/www/533-104.swf"><PARAM NAME=wmode VALUE=opaque><param name=quality value=autolow><embed src="http://gg.blueidea.com/2005/www/533-104.swf" quality=autolow pluginspage="http://www.macromedia.com/shockwave/download/index.cgi?P1_Prod_Version=ShockwaveFlash" type="application/x-shockwave-flash" width="533" height="104"></embed> 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