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js: how to find out what character key is pressed?




我想知道如何在按键时进行事件，并指定仅使用javascript按下哪个键。提前致谢

<script type="text/javascript">
    function myKeyPress(e){

        var keynum;

        if(window.event){ // IE
            keynum = e.keyCode;
        }else
            if(e.which){ // Netscape/Firefox/Opera
                keynum = e.which;
             }
        alert(String.fromCharCode(keynum));
    }
   </script>


 <form>
  <input type="text" onkeypress="return myKeyPress(event)" />
 </form>

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