动态设置默认按钮

<mce:script type="text/javascript"><!-- document.onkeydown=xx; function xx() { var se = event.srcElement; if(event.keyCode==13) { if(se.id=="textBox1") { document.getElementById("button1").focus(); document.getElementById("button1").click(); } if(se.id=="textBox2") { document.getElementById("button2").focus(); document.getElementById("button2").click(); } } } // --></mce:script><form id="form1" runat="server"> <div> <table width="100%" cellpadding="2" cellspacing="2" border="1"> <tr> <td> <asp:TextBox ID="textBox1" runat="server"></asp:TextBox></td> <td> <asp:TextBox ID="textBox2" runat="server"></asp:TextBox></td> </tr> <tr> <td> <asp:Button ID="button1" runat="server" Text="button1" OnClick="button1_Click"></asp:Button></td> <td> <asp:Button ID="button2" runat="server" Text="button2" OnClick="button2_Click"></asp:Button></td> </tr> </table> </div> </form>