javascript操作cookie_获取与修改代码

function $Cookie(){ 
var a=arguments.callee; 
var b=a._cached; 
if(a._cached){return a._cached} 
if(!(this instanceof a)){return new a} 
if(typeof a._cached=="undefined"){a._cached=this} 
} 
$Cookie.prototype.get=function(e){ 
var a=document.cookie.split(/\s*;\s*/); 
var d=new RegExp("^(\\s*"+e+"\\s*=)"); 
for(var b=0;b<a.length;b++){ 
if(d.test(a[b])){return unescape(a[b].substr(RegExp.$1.length))} 
} 
return null 
}; 
$Cookie.prototype.set=function(e,f,d,a){ 
var b=""; 
if(typeof d=="number"){b=";expires="+(new Date((new Date()).getTime()+d*1000*60*60*24)).toGMTString()} 
if(typeof a=="undefined"){a=""} 
document.cookie=e+"="+escape(f)+b+"; path=/"+(a?"; domain="+a:""); 
return this 
}; 
$Cookie.prototype.remove=function(a){ 
if(this.get(a)!=null){this.set(a,"",-1)} 
return this 
};