AutoPostBack的CheckBox无刷新

<% @ Page Language = " C# " AutoEventWireup = " true " CodeFile = " Default2.aspx.cs " Inherits = " Default2 " %>

<! DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >
< html xmlns ="http://www.w3.org/1999/xhtml" >
< head runat ="server" >
    < title > 无标题页 </ title >
< script type ="text/javascript" >
function setDisplay(o)
{
    var b1 = document.getElementById( " <%=Button1.ClientID%> " );
    var b2 = document.getElementById( " <%=Button2.ClientID%> " );
   
    b1.style.display = o.checked ? "" : " none " ;
    b1.style.display = o.checked ? " none " : "" ;
}
</ script >
</ head >
< body >
    < form id ="form1" runat ="server" >
        < div >
            < asp:CheckBox ID ="CheckBox1" runat ="server" onclick ="setDisplay(this)" ></ asp:CheckBox >
            < asp:Button ID ="Button1" runat ="server" Text ="Button1" ></ asp:Button >
            < asp:Button ID ="Button2" runat ="server" Text ="Button2" ></ asp:Button >
        </ div >
    </ form >
</ body >
</ html >