CSDN轮换广告图片轮换效果

/*---------------------------------------------------------------------------*\
|  subject: javascript framework
|  author:  meizz
|  created: 2005-02-27
|  version: 2006-08-31
|-----------------------------------
|  msn: [e-mail] qq:112889082 copyright (c) meizz
|  http://www.meizz.com/jsframework/ mit-style license
|  the above copyright notice and this permission notice shall be
|  included in all copies or substantial portions of the software
\*---------------------------------------------------------------------------*/

window.system = function(){this.sethashcode();}

system.debug=false; //false
system._codebase={};
try
{
  if (window!=parent && parent.system && parent.system._codebase)
    system._codebase = parent.system._codebase;
  else if ("undefined"!=typeof opener&&opener.system&&opener.system._codebase)
    system._codebase = opener.system._codebase;
  else if ("undefined"!=typeof dialogarguments && dialogarguments.system)
    system._codebase = dialogarguments.system._codebase;
}
catch(ex){}

system.missing_argument="missing argument";
system.argument_parse_error="the argument cannot be parsed";
system.not_supported_xmlhttp="your browser do not support xmlhttp";
system.file_not_found="file not found";
system.miscoding="maybe file encoding is not ansi or utf-8";
system.namespace_error=" nonstandard namespace";

system.hashcounter=0;
system.currentversion="20060831";
var t=document.getelementsbytagname("script");
t=(system.scriptelement=t[t.length-1]).src.replace(/\\/g, "/");
system.extend=function(d,s){for(var i in s)d[i]=s[i];return d;};
system.path=(t.lastindexof("/")<0)?".":t.substring(0, t.lastindexof("/"));
system.getuniqueid=function(){return "mz_"+(system.hashcounter++).tostring(36);};
system.tohashcode=function(e)
{
  if("undefined"!=typeof e.hashcode) return e.hashcode;
  return e.hashcode=system.getuniqueid();
};
system.supportsxmlhttp=function()
{
  return "object"==typeof(system._xmlhttp||(system._xmlhttp=new xmlhttprequest()));
};
system._getprototype=function(namespace, argu)
{
  if("undefined"==typeof system._prototypes[namespace])return new system();
  for(var a=[], i=0; i<argu.length; i++) a[i]="argu["+ i +"]";
  return eval("new (system._prototypes['"+namespace+"'])("+a.join(",")+")");
};
system.ie=navigator.useragent.indexof("msie")>0 && !window.opera;
system.ns=navigator.vendor=="netscape";
system.alert=function(msg){if(system.debug)alert(msg);};
system._parseresponsetext=function(s)
{
    if (null==s||"\ufffd"==s.charat(0)){system.alert(system.miscoding);return "";}
    if ("\xef"==s.charat(0))s=s.substr(3); //for firefox
    return s.replace(/(^|\n)\s*\/\/+\s*((using|import|include)\((\"|\'))/g,"$1$2");
};

if(window.activexobject && (system.ie || !window.xmlhttprequest))
{
  window.xmlhttprequest = function()
  {
    var msxmls=['msxml3','msxml2','microsoft'];
    for(var i=0;i<msxmls.length;i++)
      try{return new activexobject(msxmls[i]+'.xmlhttp')} catch(ex){}
    system._xmlhttp="mz"; throw new error(system.not_supported_xmlhttp);
  }
}
system.load = function(namespace, path)
{
  try
  {
    if(system.supportsxmlhttp()){path=system._mappath(namespace, path);
    var x=system._xmlhttp; x.open("get",path,false); x.send(null);
    if (x.readystate==4)
    {
      if(x.status==0||/^file\:/i.test(path))
        return system._parseresponsetext(x.responsetext);
      else if(x.status==200)return system._parseresponsetext(x.responsetext);
      else if(x.status==404)system.alert(namespace+"\n"+system.file_not_found);
      else throw new error(x.status +": "+ x.statustext);}
    } else system.alert(system.not_supported_xmlhttp);
  }
  catch(ex){system.alert(namespace+"\n"+ex.message);}return "";
};
system._eval = function(namespace, path)
{
  //alert("system._eval(\""+namespace+"\")=\r\n"+system._codebase[namespace]);
  try{if(window.execscript)window.execscript(system._codebase[namespace]);else
  {
    var script=document.createelement("script");script.type="text/javascript";
    script.innerhtml="eval(system._codebase['"+ namespace +"']);";
    document.getelementsbytagname("head")[0].appendchild(script);
    settimeout(function(){script.parentnode.removechild(script)},99);
  }}catch(ex){system.alert("syntax error on load "+ namespace);}
  system._existences[namespace]=system._mappath(namespace, path);
};
system._exist = function(namespace, path)
{
  if("undefined"==typeof system._existences[namespace]) return false;
  return system._existences[namespace]==system._mappath(namespace,path);
};
system._mappath = function(namespace, path)
{
  if("string"==typeof path && path.length>3) return path;
  var p=system.path +"/"+ namespace.replace(/\./g,"/") +".js";
  return p +(("undefined"==typeof path||path) ? "" : "?t="+ math.random());
};

window.using = function(namespace, path, rename)
{
  if(system._exist(namespace, path)){
  var s=window[namespace.substr(namespace.lastindexof(".")+1)];
  if(s!=system._prototypes[namespace])s=system._prototypes[namespace];return}
  var code=namespace +"."; if(!/((^|\.)[\w\$]+)+$/.test(namespace))
  throw new error(namespace+system.namespace_error);
  for(var i=code.indexof("."); i>-1; i=code.indexof(".", i+1)){
  var e= code.substring(0,i), s=(e.indexof(".")==-1) ? "window[\""+e+"\"]":e;
  if(e&&"undefined"==typeof(s)){
  eval(s+"=function(){return system._getprototype(\""+e+"\", arguments)}");}}
  if("undefined"==typeof path &&"string"==typeof system._codebase[namespace])
  {
    system._eval(namespace, path);}else{if(code=system.load(namespace,path)){
    e = "$"+ system.getuniqueid() +"__id"+ new date().gettime() +"$";
    s = "function "+e+"(){\r\n"+code+";\r\nsystem._prototypes['";
    code=namespace.substr(namespace.lastindexof(".")+1);
    s += namespace+"']=window['"+(rename||code)+"']="+code+";\r\n}"+e+"();";
    system._codebase[namespace]=s;s="";system._eval(namespace, path);}
  }
};
window.import=function(namespace,path,rename){using(namespace,path,rename)};
window.instance=function(hashcode){return system._instances[hashcode]};
window.include=function(namespace, path)
{
  if(system._exist(namespace, path)) return;
  var code;if(!/((^|\.)[\w\$]+)+$/.test(namespace))
  throw new error(namespace + system.namespace_error);
  if("undefined"==typeof path&&"string"==typeof(system._codebase[namespace]))
  {
    system._eval(namespace, path);}else if(system.supportsxmlhttp()){
    if(code=system.load(namespace, path)){system._codebase[namespace]=code;
    system._eval(namespace, path);}}else{
    var script=document.createelement("script");script.type="text/javascript";
    script.src=system._existences[namespace]=system._mappath(namespace,path);
    document.getelementsbytagname("head")[0].appendchild(script);
    settimeout(function(){script.parentnode.removechild(script)},99);
  }
};

function.read=1;function.write=2;function.read_write=3;
function.prototype.addproperty=function(name,initvalue,r_w)
{
  var capital=name.charat(0).touppercase()+name.substr(1);
  r_w=r_w||function.read_write; name="_"+name; var p=this.prototype;
  if("undefined"!=typeof initvalue) p[name]=initvalue;
  if(r_w&function.read) p["get"+ capital]=function(){return this[name];};
  if(r_w&function.write) p["set"+ capital]=function(v){this[name]=v;};
};
function.prototype.extends=function(superclass,classname)
{
  var op=this.prototype, i, p=this.prototype=new superclass();
  if(classname)p._classname=classname; for(i in op)p[i]=op[i];
  if(p.hashcode)delete system._instances[p.hashcode];return p;
};
system._instances={};
system._prototypes=
{
  "system":system,
  "system.object":system,
  "system.event":system.event
};
system._existences=
{
  "system":system._mappath("system"),
  "system.event":system._mappath("system.event"),
  "system.object":system._mappath("system.object")
};
t=system.extends(object, "system"); system.object = system;
t.decontrol=function(){var t;if(t=this.hashcode)delete system._instances[t]};
t.addeventlisteners=function(type, handle)
{
  if("function"!=typeof handle)
    throw new error(this+" addeventlistener: "+handle+" is not a function");
  if(!this._listeners) this._listeners={};
  var id=system.tohashcode(handle), t=this._listeners; 
  if("object"!=typeof t[type]) t[type]={}; t[type][id]=handle;
};
t.removeeventlistener=function(type, handle)
{
  if(!this._listeners)this._listeners={}; var t=this._listeners;
  if(!t[type]) return; var id=system.tohashcode(handle);
  if( t[type][id])delete t[type][id];if(t[type])delete t[type];
};
t.dispatchevent=function(evt)
{
  if(!this._listeners)this._listeners={};
  var i, t =this._listeners, p =evt.type;
  evt.target=evt.srcelement=evt.target||evt.srcelement||this;
  evt.currenttarget=this; if(this[p])this[p](evt);
  if("object"==typeof t[p]) for(i in t[p]) t[p][i].call(null, evt);
  delete evt.target;delete evt.currenttarget;delete evt.srcelement;
  return evt.returnvalue;
};
t.sethashcode=function()
{
  system._instances[(this.hashcode=system.getuniqueid())]=this;
};
t.gethashcode=function()
{
  if(!this.hashcode)this.sethashcode(); return this.hashcode;
};
t.tostring=function(){return "[object "+(this._classname||"object")+"]";};
system.event=function(type){this.type=type;};
t=system.event.extends(system, "system.event");
t.returnvalue=true; t.cancelbubble=false;
t.target=t.currenttarget=t.srcelement=null;
t.stoppropagation=function(){this.cancelbubble=true;};
t.preventdefault =function(){this.returnvalue=false;};

if(system.ie && !system.debug) include("system.plugins.ie"); //ie userdata
if(window.opera) include("system.plugins.opera"); //opera support
include("system.global");