ajax局部刷新实例 (三种方法推荐)

<script> 

setInterval("refreshTime()",1000); //每格1秒刷新一次 

funciton refreshTime() 

{ 

var dateObj = new Date(); 

time.innerHTML = dateObj.toLocaleDateString(); //刷新div里面的内容 

} 

</script> 

<div id=time> </div> 

function doRef() 

{ 

var url = "xxx.aspx" 

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

dateRequest.abort() ; 

dateRequest.open( "GET",url,true ); 

dateRequest.onreadystatechange = onSendSelf ; 

dateRequest.send() ; 

function onSendSelf() 

{ 

if( dateRequest.readyState != 4 ) 

{ 

return ; 

} 

var theDate = dateRequest.responseText ;//如果出现编码问题,可以在服务端escape一下,然后在这里使用unescape( responseText ) 

theDiv.innerHTML = theDate ; 

} 

} 

setInterval( doRef,1000 ) ;//1秒刷新一次，有点快

<form id="form1" runat="server"> 

<asp:ScriptManager ID="ScriptManager1" runat="server"> 

</asp:ScriptManager> 

<br /> 

<asp:UpdatePanel ID="UpdatePanel1" runat="server"> 

<ContentTemplate> 

<asp:Timer ID="Timer1" runat="server" Interval="1000" OnTick="Timer1_Tick"> 

</asp:Timer> 

<asp:TextBox ID="TextBox1" runat="server"> </asp:TextBox> 

</ContentTemplate> 

</asp:UpdatePanel> 

</form>