title: Pure JavaScript to detect only Ctrl+Q shortcuts
body: <p>I want to use shortcut to handle a task in Javascript (not JQuery or any Javascript libraries). For example, I want to use Ctrl+Q to write an alert. My issue is only to use Ctrl+Q, combination of other keys such as Ctrl+Q+other key will not handle the alert. How can I do?</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-js lang-js prettyprint-override"><code>document.addEventListener('keydown', function(event){
    if(event.ctrlKey &amp;&amp; event.keyCode == 81) console.log('alert');
  });</code></pre>
  </div>
  </div>
  </p>
  
  <p>I only want Ctrl+Q work, not for Ctrl+Shift+Q, Ctrl+Alt+Q, Ctrl+Q+(some key else)</p>