IE、FireFox關於event時間的區別

  <input type="button" name="someButton" value="提交" onclick="javascript:gotoSubmit(event)"/>
                 <script language="javascript">
                function gotoSubmit(evt) {
                    evt = evt ? evt : (window.event ? window.event : null);
                    ...
                    alert(evt);             // use evt
                    ...
                }firefox沒有全局的event事件