javascript 操作cookie类

 1 String.prototype.Trim = function()
 2 {
 3     return this.replace(/^\s+/g,"").replace(/\s+$/g,"");
 4 }
 5 
 6 function JSCookie()
 7 {
 8     this.GetCookie = function(key)
 9     {
10         var cookie = document.cookie;
11         var cookieArray = cookie.split(';');
12         var getvalue = "";
13         for(var i = 0;i<cookieArray.length;i++)
14         {
15             
16             if(cookieArray[i].Trim().substr(0,key.length) == key)
17             {
18                 getvalue = cookieArray[i].Trim().substr(key.length + 1);
19                 break;
20             }
21         }
22 
23         return getvalue;
24     };
25     this.GetChild = function(cookiekey,childkey)
26     {
27         var child = this.GetCookie(cookiekey);
28         var childs = child.split('&');
29         var getvalue = "";
30         
31         for(var i = 0;i < childs.length;i++)
32         {
33             if(childs[i].Trim().substr(0,childkey.length) == childkey)
34             {
35                 getvalue = childs[i].Trim().substr(childkey.length + 1);
36                 break;
37             }
38         }
39         return getvalue;
40     };
41     this.SetCookie = function(key,value,expire,domain,path)
42     {
43         var cookie = "";
44         if(key != null && value != null)
45             cookie += key + "=" + value + ";";
46         if(expire != null)
47             cookie += "expires=" + expire.toGMTString() + ";";
48         if(domain != null)
49             cookie += "domain=" + domain + ";";
50         if(path != null)
51             cookie += "path=" + path + ";";
52         document.cookie = cookie;
53     };
54     this.Expire = function(key)
55     {
56         expire_time = new Date();
57         expire_time.setFullYear(expire_time.getFullYear() - 1);
58         var cookie = " " + key + "=e;expires=" + expire_time + ";"
59         document.cookie = cookie;
60     }
61 }


用法：
一、设置cookie
var cookie = new JSCookie();
//普通设置
cookie .SetCookie("key1","val1");

//过期时间为一年
var expire_time = new Date();
expire_time.setFullYear(expire_time.getFullYear() + 1);
cookie .SetCookie("key2","val2",expire_time);

//设置域及路径，带过期时间
cookie .SetCookie("key3","val3",expire_time,".cnblogs.com","/");

//设置带子键的cookie,子键分别是k1,k2,k3
cookie .SetCookie("key4","k1=1&k2=2&k3=3");

二、读取cookie
//简单获取
cookie .GetCookie("key1");
cookie .GetCookie("key2");
cookie .GetCookie("key3");
cookie .GetCookie("key4");
//获取key4的子键k1值
cookie .GetChild("key4","k1");

三、删除
cookie .Expire("key1");
cookie .Expire("key2");
cookie .Expire("key3");
cookie .Expire("key4");