回车提交JS

<html>
<head>
    <title>儒通软件测试</title>

    <script language="javascript" type="text/javascript">
function enterkey()
{
    try
    {
        var el_keydown=window.event.srcElement;
        if(event.keyCode==13 && el_keydown.id=="txt1")
        {
            txt2.focus();
        }
        else if(event.keyCode==13 && el_keydown.id=="txt2")
        {
            btn.focus();
        }
    }
    catch(e)
    {
        return;
    }
}

    </script>

</head>
<body>
    <input type="text" id="txt1" onkeydown="enterkey();"/><br/>
    <input type="text" id="txt2" onkeydown="enterkey();"/><br/>
    <input type="button" id="btn" value="button" onclick="alert(txt2.value)">
</body>
</html>

仅限IE