jQuery部分 

代码如下:

<script src="JS/jquery-1.8.3.js" type="text/javascript"></script> 

<script type="text/javascript"> 

$(function () { 

var elm = $('#pordAttr'); 

var startPos = $(elm).offset().top; 

$.event.add(window, "scroll", function () { 

var p = $(window).scrollTop(); 

$(elm).css('position', ((p) > startPos) ? 'fixed' : 'static'); 

$(elm).css('top', ((p) > startPos) ? '0px' : ''); 

}); 

}); 

</script> 

HTML部分 

代码如下:

<div id="pordAttr"> 

<input type="text" value="奇异果" id="txtSearchImage" runat="server" /> 

<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" /> 

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