function $Util(){

	this.doPost=function(arg){
		$.post(arg.url, arg.params,function(txt){ arg.func(txt);}, arg.type);
	};
	//在url后面追加时间戳
	this.urlAddTimestamp=function(url){
		var timestamp = Date.parse(new Date());
		return url+"timestamp="+timestamp;
	};
}

var $util=new $Util();