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 "";
 };