<script src="js/jquery-1.5.2.min.js" type="text/javascript"></script>
    <script type="text/javascript">
        $(function() {
            $.post("CacheDemo.aspx", { "strWidth": window.screen.width,"strHeight":window.screen.height }, function(data, status) {
                if (status == "success") {
                }
            });
});
    </script>

------解决方案--------------------
js:
  <script language="javascript" type="text/javascript">
  
 var w=screen.width; 
 var h=screen.height; 
 //alert( "当前显示器分辨率 "+w+ "* "+h); 
 document.getElementById("w").value = w;
 document.getElementById("h").value = h;

 </script>
页面：
 <asp:hiddenfield id="w" runat="server" value=""></asp:hiddenfield>
 <asp:hiddenfield id="h" runat="server" value=""></asp:hiddenfield>

page_load中，
  protected void Page_Load(object sender, EventArgs e)
 {
  
 TextBox1.Text = "height = " + h.value;
  
 TextBox2.Text = "width = " + w.value;
 ｝