1     //写cookies
 2     function setCookie(name,value)
 3     {
 4         var Days = 30;
 5         var exp = new Date();
 6         exp.setTime(exp.getTime() + Days*24*60*60*1000);
 7         document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString();
 8     }
 9 
10     //读取cookies
11     function getCookie(name)
12     {
13         var arr,reg=new RegExp("(^| )"+name+"=([^;]*)(;|$)");     
14         if(arr=document.cookie.match(reg)){
15             return unescape(arr[2]);
16         }else{
17             return null;
18         }
19     }
20 
21     //删除cookies
22     function delCookie(name)
23     {
24         var exp = new Date();
25         exp.setTime(exp.getTime() - 1);
26         var cval=getCookie(name);
27         if(cval!=null)
28         document.cookie= name + "="+cval+";expires="+exp.toGMTString();
29     }