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 == -) {         end = document.cookie.length;       }       return decodeURIComponent(document.cookie.substring(start+name.length+,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() + ****);         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(), 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 = , len = arr.length; i < len; i++) {         var tmpArr = arr[i].split(':');         obj[decodeURIComponent(tmpArr[])] = decodeURIComponent(tmpArr[]);       }       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(), 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(); })();