Обработка нажатия клавиш jQuery

$('#myTable tbody').on('click', 'tr', function(e) { 
  if (e.ctrlKey) { 
    $(this).toggleClass('selected'); 
  } 
});

.selected { 
  background: #f00; 
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> 
<table id="myTable"> 
  <tbody> 
    <tr> 
      <td>1</td> 
      <td>2</td> 
    </tr> 
    <tr> 
      <td>1</td> 
      <td>2</td> 
    </tr> 
    <tr> 
      <td>1</td> 
      <td>2</td> 
    </tr> 
    <tr> 
      <td>1</td> 
      <td>2</td> 
    </tr> 
  </tbody> 
</table>