js脚本捕获事件event，已经回车触发事件

 <script  type="text/javascript" language="javascript">
      function textBoxOnKeyDown(evt)
            { 
             var event= (evt) ? evt : ((window.event) ? window.event : "");
              if(event.keyCode == 13)
                {
                  login_submit();
//                 WebForm_FireDefaultButton(event, 'Button2');
//                    __doPostBack('Button2','');
               }
           }
     </script>

 

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<input class="userinpu02" id="checkcode" name="" type="text" tabindex="0"  onkeydown="textBoxOnKeyDown(event);"/>