ajax局部刷新

<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>

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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

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<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>

=====在后台Timer1_Tick事件加上

// Interval="1000" 是设置刷新的时间间隔

TextBox1.Text=DateTime.Now

看下就明白了