cookie方法封装及cookie缺点分析

 1 var CookieUtil = {
 2  get: function(name) {
 3   var cookieName = encodeURIComponent(name) + "=",
 4    cookieStart = document.cookie.indexOf(cookieName),
 5    cookieValue = null;
 6   if(cookieStart > -1) {
 7    var cookieEnd = document.cookie.indexOf(";", cookieStart);
 8    if(cookieEnd == -1) {
 9     cookieEnd = document.cookie.length;
10    }
11    cookieValue = decodeURIComponent(document.getCookie.substring(cookieStart + cookieName.length, cookieEnd));
12   }
13   return cookieValue;
14  },
15  set: function(name, value, expires, path, domain, secure) {
16   var cookieText = encodeURIComponent(name) + "=" +
17    encodeURIComponent(value);
18   if(expires instanceof Date) {
19    cookieText += "; expires=" + expires.toGMTString();
20   }
21   if(path) {
22    cookieText += "; path=" + path;
23   }
24   if(domain) {
25    cookieText += "; domain=" + domain;
26   }
27   if(secure) {
28    cookieText += "; secure";
29   }
30   document.cookie = cookieText;
31  },
32  unset: function(name, path, domain, secure) {
33   this.set(name, "", new Date(0), path, domain, secure);
34  }
35 };

//设置一个 cookie
CookieUtil.set("name", "wolfSoul"); 

//读取 cookie 的值
alert(CookieUtil.get("name")); // "wolfSoul"

//删除 cookie
CookieUtil.unset("name");