title: Angular 2 method for querySelectorAll and className
body: <p>I would like to know the best way to define functions to get all elements of a list and apply/remove a class style to all of it.</p>
  
  <pre><code>var x = document.querySelectorAll(".example &gt; li");
  
  x.className = "";
  </code></pre>
  
  <p>How to angularize 2 the above? Can anyone help with an example?</p>