 <!doctype html>

 <html>

  <head>

      <meta charset="utf-8"/>

      </head>

      <body>

          <button type="button"  onclick="show()">請求數(shù)據(jù)</button>

         <script src="ajax.js"></script>

         <script>

           function show(){

             Ajax('read.txt?datetime=new Date.getTime ',function(str){alert(str);},function(){alert('失敗了');})

           };

         </script>

      </body>

 </html>

javascript代碼

復(fù)制代碼代碼如下:

  function Ajax(url,fnSucc,fnFaild)

             {

                  //1.創(chuàng)建ajax對象

                if(window.XMLHttpRequest)

                 {// code for IE7+, Firefox, Chrome, Opera, Safari

                      var oAjax=new XMLHttpRequest();

                 }

                else

                 {// code for IE6, IE5

                     var oAjax=new ActiveXObject("Microsoft.XMLHTTP");

                 }

                 //2.鏈接服務(wù)器（打開服務(wù)器的連接）

                 //open(方法，文件名，異步傳輸)

                 oAjax.open('GET',url,true);

                 //3.發(fā)送

                 oAjax.send();

                 //4.接收返回

                 oAjax.onreadystatechange=function()

                    {

                      if (oAjax.readyState==4)

                      {

                        if(oAjax.status==200)

                          { 

                            fnSucc(oAjax.responseText);  

                          }

                       else

                          {

                           fnFaild(oAjax.status);

                          }

                      };

                 };

              }