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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); } else alert("请求失败:" + req.statusText); return true; }; return req; }, encode : function (str) { return encodeURIComponent(str); }};