用太久JQuery了，别忘了Ajax原生是怎么写的
var Ajax = {get : function (url, callback) {var req = Ajax.getRequest(callback);req.open("GET", url, true);req.setRequestHeader("If-Modified-Since","0");req.send(null);},post : function (url, param, callback) {var req = Ajax.getRequest(callback);req.open("POST", url, true);req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");req.setRequestHeader("If-Modified-Since","0");req.send(param);},getRequest : function (callback) {var req;try {req = new XMLHttpRequest();} catch (error) {try {req = new ActiveXObject("Microsoft.XMLHTTP");} catch (error) {return null;}}req.onreadystatechange = function() {if (req.readyState != 4)return;if (req.status == 200) {callback(req);} elsealert("请求失败:" + req.statusText);return true;};return req;},encode : function (str) {return encodeURIComponent(str);}};
本文转自 海角在眼前 博客园博客，原文链接：/lovesong/p/3266754.html，如需转载请自行联系原作者
