JavaScript对cookie的基本操作

JavaScript读取cookie不是很直观，我们可以简化下cookie的功能。基本的cookie操作有三种：读取、写入、删除。

用CookieUtil对象如下表示：

var CookieUtil={
       get:function (name){
              var cookieName=encodeURIComponent(name)+"=",
              var cookieStart=document.cookie.indexOf(cookieName),
              var cookieValue=null;
              if(cookieStart >= -1){
                     var cookieEnd=document.cookie.indexOf(";",cookieStart)
                     if(cookieEnd==-1){
                             cookieEnd=document.cookie.length;
                     }

                     cookieValue=decodeURIComponent(document.cookie.substring(cookieStart+cookieName.length,cookieEnd));

             }
             return cookieValue;
        },


        set:function(name,value,expires,path,domain,secure){
               var cookieText=encodeURIComponent(name)+"="+encodeURIComponent(value);
               if(expires instanceof Date){
                       cookieText += "; expires=" + expires.toGMTString();
               }

               if(path){
                       cookieText += "; path=" + path;          
               }

               if(domain){
                       cookieText += "; domain=" + domain;
               }

               if(secure){
                       cookieText += "; secure=" + secure;
               }
        },

        usset:function( name , path , domain ,secure){
               this.set(name, "", new Date(0), path, domain, secure);
        }
};

 

这些方法可以使用如下：

//设置cookie
CookieUtil.set("MyCookie", "Test");

//读取cookie值
var MyValue=CookieUtil.get("MyCookie");   // Test

//删除cookie
CookieUtil.usset("MyCookie");

//设置1个cookie，包括它的路径、域、截止日期
CookieUtil.set("MyCookie", "Test", "/2012/02/", "www.iteye.com", new Date(2012,1,23));

//删除同一cookie
CookieUtil.unset("MyCookie", "/2012/02/", "www.iteye.com");

//设置一个安全cookie
CookieUtil.set("MyCookie", "Test", null, null, null, true);

 

ok!!