My study notes Ajax

1. Different browsers create XMLHttpRequest object methods (functions generic)
<Script type = "text / JavaScript">
function the ajaxFunction ()
{
var xmlHttp ;
the try
    {
   // Firefox, Opera 8.0+, Safari
    xmlHttp=new XMLHttpRequest();
    }
the catch (E)
    {
/ / Internet Explorer
   the try
      {
    // IE 6.0+
      xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
      }
   the catch (E)
      {
      the try
         {
        // IE 5.5+
         xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
         }
      the catch (E)
         {
         Alert ( "your browser does not support AJAX!");
         return false;
         }
      }
    }
}
</ Script>
2. a simple Ajax application example
<HTML>
<body>
<Script type = "text / JavaScript">
function the ajaxFunction ()
{
var xmlHttp ;
the try
    {
   // Firefox, Opera 8.0+, Safari
    xmlHttp=new XMLHttpRequest();
    }
the catch (E)
    {
// Internet Explorer
   the try
      {
      xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
      }
   the catch (E)
      {
      the try
         {
         xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
         }
      the catch (E)
         {
         Alert ( "your browser does not support AJAX!");
         return false;
         }
      }
    }
    xmlHttp.onreadystatechange =function()
      {
    //4代表请求已完成
      if( xmlHttp.readyState ==4)
        {
         document.myForm.time.value= xmlHttp.responseText ;
        }
      }
    xmlHttp.open("GET","time.asp",true);
    xmlHttp.send(null);
}
</script>
<form name="myForm">
用户: <input type="text" name="username" onkeyup="ajaxFunction();" />
时间: <input type="text" name="time" />
</form>
</body>
</html> <%

This is the "time.asp" code:

-1 = Response.Expires         // page is not cached
Response.Write (Time)
%>

Reproduced in: https: //www.cnblogs.com/guoxiaowen/archive/2008/03/27/1125344.html

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