失去URL参数和Cookie

得到URL参数和Cookie
function getRefValue(refstring,tag)
{
//获取参数
var pos1;
var pos2;
if (-1==(pos1=refstring.indexOf(tag))) return "";
if (-1==(pos2=refstring.indexOf("&",pos1+1))) pos2=refstring.length;
return(refstring.substring(pos1+tag.length,pos2));
}

/*
* WebFXCookie class
*/

function WebFXCookie() {
if (document.cookie.length) { this.cookies = ' ' + document.cookie; }
}

WebFXCookie.prototype.setCookie = function (key, value) {
document.cookie = key + "=" + escape(value);
}

WebFXCookie.prototype.getCookie = function (key) {
if (this.cookies) {
var start = this.cookies.indexOf(' ' + key + '=');
if (start == -1) { return null; }
var end = this.cookies.indexOf(";", start);
if (end == -1) { end = this.cookies.length; }
end -= start;
var cookie = this.cookies.substr(start,end);
return unescape(cookie.substr(cookie.indexOf('=') + 1, cookie.length - cookie.indexOf('=') + 1));
}
else { return null; }
}