Ajax 实例

上次写了个 Microsoft 版的Ajax，下面介绍一下正式的Ajax ,废话少说，看代码---

 

   <script type="text/javascript" language="javascript">
   
     function ajaxFunction()
     {
      var xmlHttp;
      try
      {
         //兼容火狐、Opera 8.0+, Safari
        xmlHttp=new XMLHttpRequest();

      }
      catch(e)
      {
         try
         {
            xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");

         }
         catch(e)
         {
            try
            {
                xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");      
            }
            catch(e)
            {
              alert("您的IE不支持Ajax！");
              return false;
            }
         }
       }
   
     xmlHttp.onreadystatechange=function()
     {
         if(xmlHttp.readyState==4 && xmlHttp.status == 200)
         {
           
            document.write(xmlHttp.responseText);
         }
     }
     xmlHttp.open("GET","Default2.aspx",true);
     xmlHttp.send(null);   
     } 
    </script>

 

  页面上添加了 个Button

   <asp:Button runat="server" Text="sss" OnClientClick="ajaxFunction()" />

 

 

  点击之后效果如下：