<script src="../Js/jquery-1.4.2.min.js" type="text/javascript"></script>
    <script type="text/javascript">
        $(function () {
            $("#a_doClick").click(function () {
                $("#<%=btnTest.ClientID%>").click();
            })
        })
    </script>
 

<a id="a_doClick">觸發Button的Click事件</a>
<asp:Button runat="server" ID="btnTest" Text="測試js觸發事件" OnClick="btnTest_Click" />

 protected void btnTest_Click(object sender, EventArgs e)
        {
           Response.Redirect("http://www.baidu.com");
        }