用纯XMLHttpRequest实现AJAX

 <!DOCTYPE html>

 <html xmlns="http://www.w3.org/1999/xhtml">

 <head>

     <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

     <title></title>

     <script type="text/javascript">

         /**

         *创建XMLHttpRequest对象

         */

         function createXhr() {

             var xhr = null;

             if (window.XMLHttpRequest) {

                 xhr = new XMLHttpRequest();

             }

             else {

                 xhr = new ActiveXObject("Microsoft.XMLHttp");

             }

             return xhr;

         }

         function testXHR() {

             var xhr = createXhr();

             window.alert(xhr);

         }

         function getServerTest() {

             //获取xhr对象

             var xhr = createXhr();

             //创建请求

             xhr.open("get", "ajax.ashx", true);

             //设置回调函数

             xhr.onreadystatechange = function () {

                 if (xhr.readyState == 4 && xhr.status == 200) {

                     //服务器已正常处理请求 并正确响应数据到客户端

                     var resText = xhr.responseText;

                     document.getElementById("hh").innerText = resText;

                 }

             }

             //4.发送请求

             xhr.send(null);

         }

     </script>

 </head>

 <body>

     <input type="button" value="Test Xhr" onclick="testXHR()">

     <h2 id="hh"></h2>

     <a href="javascript:getServerTest()">提交数据</a>

 </body>

 </html>
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用纯XMLHttpRequest实现AJAX

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