高手！javascript 用cookie 做购物车的问题

Question

function addtocookie( majorid,money,name,type)
{  var cookie=
   { 
   //写入COOKIES,n为Cookie名，v为value 
   Set:function(n,v,e,p,d,s){ 
   var t=new Date; 
   if(e){ 
    // 8.64e7 一天 3.6e6 一小时 
   t.setTime(t.getTime() + (e*8.64e7)); 
   } 
   document.cookie=n+'='+v+'; '+(!e?'':'; expires='+t.toUTCString())+(!p?'':'; path='+p)+(!d?'':';domain='+d)+(!s?'':'; secure') // Set cookie 
   }
  };   var str = majorid.Trim() + "=" +majorid.Trim()+"|"+escape(name)+"|"+money+"|1"+"|"+type;
   var shop = document.cookie;   cookie.Set("shoppingcart",str,2,"/")}问题是，我加了一个内容是，就把上一个给覆盖了，这么解决这个问题啊

Answer 1

function deleteCookie (name) {  
var exp = new Date();  
exp.setTime (exp.getTime() - 1);  
var cval = '';
setCookieGG(name,'',exp,'www.svnhost.cn');
}
var expdategt = new   Date(2010,2,31);
function setCookieGG(cookiename,cookievalue,cookieexpdate)
{
    document.cookie = cookiename + "=" + cookievalue
    + "; domain=www.svnhost.cn"
    + "; path=" + "/"
    + "; expires=" + cookieexpdate.toGMTString();
}
function GetCookieGG(cookiename)
{
    var thebigcookie = document.cookie;
    var firstchar = thebigcookie.indexOf(cookiename);
    if (firstchar != -1) {
        firstchar += cookiename.length + 1;
        lastchar = thebigcookie.indexOf(";",firstchar);
        if(lastchar == -1) lastchar = thebigcookie.length;
        return unescape(thebigcookie.substring(firstchar, lastchar));
    }
    return "";
}