一、原生Ajax代码的封装如下:
(function() { var XHR = { createStandardXHR: function() { return new XMLHttpRequest(); }, createIEXHR: function () { return new ActiveXObject("Microsoft.XMLHTTP"); }, createErrorXHR: function () { alert("Your browser does not support XMLHTTP."); return null; }, createXHR: function() { //创建XMLHttpRequest对象 var xhr = null; if (window.XMLHttpRequest) { this.createXHR = this.createStandardXHR; // Firefox, Opera 8.0+,Safari，IE7+ } else { this.createXHR = this.createIEXHR; // IE5、IE6 } try { xhr = this.createXHR(); } catch (e) { this.createXHR = this.createErrorXHR; xhr = this.createXHR(); } return xhr; }, ajax: function(opts) { var xhr = this.createXHR(), ajaxMethod = (opts.type || "GET").toUpperCase(), isPost = ajaxMethod == "POST", data = this.param(opts.data), url = this.buildUrlParam(opts.url, data, isPost); xhr.open(ajaxMethod, url, opts.async == undefined ? true : opts.async); if (isPost) { xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded"); } if (opts.contentType) { xhr.setRequestHeader("Content-type", opts.contentType); } var stateChange = this.xhrStateChange; xhr.onreadystatechange = function() { stateChange(xhr, opts.success, opts.error); } xhr.send(isPost ? data : null); }, buildUrlParam: function(url,data,isPost) { if (data && !isPost) { if (url.indexOf("?") < 0) { url += "?" + data; } else { url += "&" + data; } } return url; }, param: function(data) { if (!data) { return null; } if (typeof data !== "object") { return data; } var postData = []; for (var key in data) { postData.push(key+"="+data[key]); } return postData.join("&"); }, xhrStateChange: function(xhr, successFn, failFn) { if (xhr.readyState == 4) { // 4 = "loaded" if (xhr.status == 200) { // 200 = OK successFn(xhr.responseText); } else { failFn.call(xhr, xhr.statusText, xhr.status); } } else { failFn.call(xhr, xhr.statusText, xhr.status); } } }; window.ajax = function(opts) { XHR.ajax.call(XHR, opts); };})(); 二、方法如下：
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