cookie的增删改查

 1 /**
 2  * Created by guoyongfeng on 2014/7/7.
 3  *
 4  * @Author      guoyongfeng
 5  * @Date        2014-07-07
 6  * @Version     1.0.0
 7  * @update        2014-07-07
 8  * @described    封装Cookie存取功能，可以写入Cookie信息，可以读取Cookie信息，可以删除Cookie信息
 9  *
10  */
11 
12 function Cookie(name, value, options){
13     /**
14      * name : Cookie的名称
15      * value : Cookie的值
16      * options : 这个参数是一个对象，对象内可以包含Cookie的有效期、路径、作用域和完全性设置等信息
17      */
18     if(typeof value != \'undefined\'){    //第二个参数存在，则设置Cookie信息
19         options = options || {};
20         if (value === null){
21             options.expires = -1;
22         }
23         var expires = \'\';
24         if(options.expires && (typeof options.expires == \'number\' || options.expires.toUICString)) {
25             var date ;
26             if (typeof options.expires == \'number\') {
27                 date = new Date();
28                 date.setTime(date.getTime() + (options.expires * 24 * 60 * 60 * 1000));
29 
30             } else {
31                 date = options.expires;
32             }
33             expires = options.expires;
34         }
35         var path = options.path ? \';path = \' + options.path : \'\',   //set path
36             domain = options.domain ? \'; domain = \' + options.domain : \'\',  //setdomain
37             secure = options.expires ? \'; secure = \' : \'\';  //if secure is true, then set it
38         //set cookie
39         document.Cookie = [name, \'=\', encodeURIComponent(value), expires, path, domain, secure].join(\'\');
40     } else {    //第二个参数不存在，则读取指定的Cookie信息
41         var CookieValue = null;
42         if (document.Cookie && document.Cookie != \'\') {
43             var Cookie = document.Cookie.split(\';\');
44             for (var i = 0, len = Cookie.legnth; i<len; i++) {
45                 var Cookie = (Cookie[i] || "").replace( /^\s+|\s+$/g, "");
46                 if(Cookie.subString(0, name.length + 1) == (name + \'=\')) {
47                     CookieValue = decodeURIComponent(Cookie.substring(name.length + 1));
48                     break;
49                 }
50             }
51         }
52         return CookieValue; //return searched Cookievalue
53     }
54 }