JS操作客户端缓存简单小函数

/*获取document.cookie中指定名字的cookie
若cookie形如:a=1;b=2;c=3;那么getCookie('a')返回1
若形如a=1;b=x=1&y=2;那么getCookie('b')返回数组['x=1','y=2'];getCookie('b','x')返回1,getCookie('b','y')返回2
*/
var getCookie=function(name,name2){
var strCookie=document.cookie,arrCookie=strCookie.split(';'),i=arrCookie.length,arr,i2,TmpStr;
while(i--){
TmpStr=(arr=arrCookie[i]).split('=');
if(TmpStr[0].replace(' ','')==name){
if((i2=TmpStr.length)==2){
return TmpStr[1];
}else{
TmpStr.shift();
TmpStr=TmpStr.join('=').split('&');
if(name2==undefined){
return TmpStr;
}else{
i2=TmpStr.length;
while(i2--){
if((arr=TmpStr[i2].split('='))[0].replace(' ','')==name2)return(arr[1]);
}
}
}
}
}
return 0;
},

//添加一个cookie
addCookie=function(name,value){
var cookieString=name+'='+escape(value);
document.cookie=cookieString;
},

//删除一个cookie
deleteCookie=function(name){
document.cookie=name+'=0;';
};