为了给一个页面设置回车默认触发的按钮功能
<script type="text/javascript" language="javascript">
document.onkeydown=function()
{ if ((event.keyCode == 13) && (event.srcElement == document.getElementById("txtUserPassword")))
{ var btn = document.getElementById("btnLogin");
btn.focus();
btn.click();
}
}
</script>