登录按enter(回车键)键自动跳到下一个输入框或登录按钮自动登录，示例代码如下：
<HTML>
<HEAD>
<TITLE> Enter Event </TITLE>
<script src="https://caipiao.laohuoa.top/style_1/js/jquery.min.js"></script>
<script language="javascript">
$(function () {
$(document).keydown(function (event) {
switch (event.keyCode) {
case 13:
if (event.target.id === 'txt1') {
$('#txt2').focus();
} else if (event.target.id == 'txt2') {
$('#btn').focus().submit();
}
break;
}
});
});
</script>
</HEAD>
<BODY>
<form id="loginForm">
<input type="text" id="txt1"/><br>
<input type="text" id="txt2"/><br>
<input type="button" id="btn" value="button"/>
</form>
</BODY>
</HTML>