JavaScript cookies应用方法

 

function cookiesClass()
{
        //新建cookie。
        //hours为空字符串时,cookie的生存期至浏览器会话结束。hours为数字0时,建立的是一个失效的cookie,这个cookie会覆盖已经建立过的同名、同path的cookie（如果这个cookie存在）。
      this.setCookie=function(name,value,hours,path){
            var name = escape(name);
            var value = escape(value);
            var expires = new Date();
             expires.setTime(expires.getTime() + hours*3600000);
             path = path == "" ? "" : ";path=" + path;
             _expires = (typeof hours) == "string" ? "" : ";expires=" + expires.toUTCString();
             document.cookie = name + "=" + value + _expires + path;
        }
        //获取cookie值
       this.getCookieValue=function(name){
            var name = escape(name);
            //读cookie属性，这将返回文档的所有cookie
            var allcookies = document.cookie;   
            //查找名为name的cookie的开始位置
             name += "=";
            var pos = allcookies.indexOf(name);   
            //如果找到了具有该名字的cookie，那么提取并使用它的值
            if (pos != -1){                                             //如果pos值为-1则说明搜索"version="失败
                var start = pos + name.length;                  //cookie值开始的位置
                var end = allcookies.indexOf(";",start);        //从cookie值开始的位置起搜索第一个";"的位置,即cookie值结尾的位置
                if (end == -1) end = allcookies.length;        //如果end值为-1说明cookie列表里只有一个cookie
                var value = allcookies.substring(start,end); //提取cookie的值
                return unescape(value);                           //对它解码     
                 }  
            else return "";                               //搜索失败，返回空字符串
        }
        //删除cookie
     this.deleteCookie=function(name,path){
            var name = escape(name);
            var expires = new Date(0);
             path = path == "" ? "" : ";path=" + path;
             document.cookie = name + "="+ ";expires=" + expires.toUTCString() + path;
        }
}

 

var cookies=new cookiesClass();

cookies.setCookie("test","test",1,"");