JavaScript 操作 Cookie

//目前b/s程序开发及应用过程中，cookie应用相当频繁
//如：用户登陆 ,保存用户偏好设置 等等
//下面的类为方面操作cookie提供了帮助
//date:2008/4/24 by danxinju

var Cookie = new Object(); //定义Cookie对象
Cookie.setCookie = function(name/*cookie键*/, value/*键值*/, option/*选项：过期设置*/){ //设置cookie
var str = name +'='+ escape(value);
if(option){
if(option.expireHours){
var d=new Date();
d.setTime(d.getTime()+option.expireHours*3600*1000);
str += '; expires='+d.toGMTString();
}
if(option.path) str += '; path='+option.path;
if(option.domain) str += '; domain='+option.domain;
if(option.secure) str += '; true';
}
document.cookie = str;
};
Cookie.getCookie = function(name/*cookie键*/){ //获取一个cookie值
var arr = document.cookie.split('; ');
if(arr.length == 0) return '';
for(var i=0; i
tmp = arr[i].split('=');
if(tmp[0] == name) return unescape(tmp[1]);
}
return '';
};
Cookie.delCookie = function(name/*cookie键*/){ //删除一个cookie
this.setCookie(name,'',{expireHours:-1});
};
Cookie.length = function(){ //获取cookie个数
return document.cookie.split('; ').length;
};

/**How to use it
Cookie.setCookie('own','this is cookie test!');
alert(Cookie.getCookie('own'));
Cookie.delCookie('own');
alert(Cookie.getCookie('own'));
**/