js判断文本框里面输入内用以后是否有回车 (兼容FF和IE)

   <html>
    <body>
    <script type="text/javascript">
    function noNumbers(e)
    {
    var keynum;


    if(window.event) // IE
        {
        keynum = e.keyCode;

        }
    else if(e.which) // Netscape/Firefox/Opera
        {
        keynum = e.which;
        }
     if(keynum==13)
   {

        alert(document.getElementById("keyWord").value);
        return false;
   }
    }
    </script>

    <form>
    Type some text (numbers not allowed):
    <input id="keyWord" name="keyWord" type="text" onkeydown="return noNumbers(event)" />
    </form>

    </html>

以下方法是其他版本大家可以试下