var CookieUtil = (function () {

     var Cookie = function () {

         // 获取单值cookie

         this.get = function(name) {

             var start = document.cookie.indexOf(encodeURIComponent(name)) ;

             var end = document.cookie.indexOf(';', start) ;

             if(end == -1) {

                 end = document.cookie.length;

             }

             return decodeURIComponent(document.cookie.substring(start+name.length+1,end));

         };

         // 设置单值cookie

         this.set = function(name, value, expires, path, domain, secure) {

             var cookieText = encodeURIComponent(name) + "=" + encodeURIComponent(value);

             // 设置默认过期时间为七天

             if(expires == undefined) {

                 var date = new Date();

                 date.setTime(date.getTime() + 7*24*60*60*1000);

                 expires = date ;

             }

             if(expires instanceof Date) {

                 cookieText += "; expires=" + expires.toGMTString();

             }

             if(path != undefined) {

                 cookieText += "; path=" + path;

             }

             if(domain != undefined) {

                 cookieText += "; domain" + domain;

             }

             if(secure != undefined) {

                 cookieText += "; secure";

             }

             document.cookie = cookieText;

         };

         // 清除单值cookie

         this.unset = function(name, path, domain, secure) {

             this.set(name, '', new Date(0), path, domain, secure );

         };

         // 设置多值cookie

         this.setAll = function(name, subCookies, expires, path, domain, secure) {

             var cookieText = ";" + encodeURIComponent(name) + "=",

             arr = new Array();

             for(var attr in subCookies) {

                 arr.push([encodeURIComponent(attr)] + ":" + encodeURIComponent(subCookies[attr]));

             }

             this.set(name, arr.join('&'), expires, path, domain, secure);

         };

         // 获取多值cookie

         this.getAll = function(name) {

             var obj = {};

             var arr = this.get(name).split('&');

             for(var i = 0, len = arr.length; i < len; i++) {

                 var tmpArr = arr[i].split(':');

                 obj[decodeURIComponent(tmpArr[0])] = decodeURIComponent(tmpArr[1]);

             }

             return obj;

         };

         // 获取多值cookie的子cookie

         this.getSub = function(name, subname) {

             var obj = this.getAll(name);

             return obj[subname];

         };

         // 清除指定的多值cookie

         this.unsetAll = function(name,path,domain,secure) {

             this.unset(name, '', new Date(0), path, domain, secure);

         };

         // 清除指定多值cookie的子cookie

         this.unsetSub = function(name, subname,path, domain, secure) {

             var obj = this.getAll(name);

             delete obj[subname];

             this.setAll(name, obj, null, path, domain, secure);

         };

     };

     return new Cookie();

 })();