简单的封装一下ajax，请大家指教。
代码如下：
(function () { var Ajax = { _ajax : null, get : function (url, data, fn) { this.ajax({ url : url, data : data, fn : fn, type : 'GET' }); }, post : function (url, data, fn) { this.ajax({ url : url, data : data, fn : fn, type : 'POST' }); }, ajax : function (obj) { typeof obj.data == 'function' && (obj.fn = obj.data, obj.data = {}); if (window.XMLHttpRequest) { this._ajax = new XMLHttpRequest(); } else { this._ajax = new ActiveXObject('Microsoft.XMLHTTP'); } var para = ''; for (var i in obj.data) { para += i + '=' + obj.data[i] + '&'; } para = para.substr(0, para.length - 1); this._ajax.open(obj.type || 'GET', obj.type == 'GET' ? obj.url.indexOf('?') != -1 ? (obj.url + '&' + para) : (obj.url + '?' + para) : obj.url, true); obj.type == 'POST' && this._ajax.setRequestHeader('Content-type', 'application/x-www-form-urlencoded'); this._ajax.onreadystatechange = function () { if (this.readyState == 4 && this.status == 200) { obj.fn(this.responseText); } }; this._ajax.send(obj.type == 'POST' ? para : null); }, abort : function () { this._ajax.abort(); } }; window.Ajax = Ajax; })();