JavaScript对Cookie的操作-设置Cookie、获得Cookie、删除Cookie（非常好用）

 function setcookie(name,value)     {         var Days = 30;         var exp  = new Date();         exp.setTime(exp.getTime() + Days*24*60*60*1000);         document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString();         //alert(document.cookie);     }     function getcookie(name)     {           var arr = document.cookie.match(new RegExp("(^| )"+name+"=([^;]*)(;|$)"));            if(arr != null)         {               return unescape(arr[2]);           }         else         {               return "";           }       }      function delcookie(name)     {           var exp = new Date();            exp.setTime(exp.getTime() - 10000);           document.cookie = name + "=a; expires=" + exp.toGMTString();            }