<body> <form id="form1" runat="server"> <asp:ScriptManager ID="ScriptManager1" runat="server"> </asp:ScriptManager> <div> <pre> 漂浮效果 HorizontalOffset，VerticalOffset：水平，垂直坐标 ScrollEffectDuration：滚动时间 </pre> <div id="d" runat="server" style="background-color: Red; 300px;"> 飘： The AlwaysVisibleControl is a simple extender allowing you to pin controls to the page so that they appear to float over the background body content when it is scrolled or resized. It targets any ASP.NET control and always keeps the position a specified distance from the desired horizontal and vertical sides. </div> <cc1:AlwaysVisibleControlExtender ID="AlwaysVisibleControlExtender1" runat="server" TargetControlID="d" HorizontalOffset="200" VerticalOffset="200" HorizontalSide="center" VerticalSide="middle" ScrollEffectDuration="0.01"> </cc1:AlwaysVisibleControlExtender> <div style="height: 800px;"> TargetControlID;ID只能为服务器端控件ID </div> </div> </form></body>TargetControlID;ID只能为服务器端控件ID