js设置与获取Cookie

/*设置与获取Cookie*/
var Cookie ={}
Cookie.write = function(key, value, duration){
var d = new Date();
d.setTime(d.getTime()+1000*60*60*24*30);
document.cookie = key + "=" + encodeURI(value) + "; expires=" + d.toGMTString();
};
Cookie.read = function(key){
var arr = document.cookie.match(new RegExp("(^| )"+key+"=([^;]*)(;|$)"));
if(arr != null)
return decodeURIComponent(arr[2]);
return "";
};