js回车提交表单的代码

<script language="javascript" type="text/javascript">
//page 有两个button，两个textbox，回车触发第二个button
var x = document.getElementById('<%=Textbox1.ClientID %>'); //获取控件对象
x.onkeydown = txtsubmit;

var y = document.getElementById('<%=TextBox2.ClientID %>');
y.onkeydown = txtsubmit;

function txtsubmit() {
  var e = event.srcElement;
  if (event.keyCode == 13) {
       document.getElementById('<%=Button2.ClientID %>').click(); //提交按钮Button2
       return false;
   }
}
</script>