title: Angular 2.x selecting DOM element
body: <p>I know it should be easy but angular 2.0 has no many examples yet..</p>
  
  <p>In one of my components in some case I need to add class on my body tag. But my application is bootstrapped deeper than body, so I need something like</p>
  
  <pre><code>angular.element('body').addClass('fixed');
  </code></pre>
  
  <p>but in Angular 2.0..</p>
  
  <p>BTW, I know I can somehow bootstrap my application to include <code>body</code> tag, but I think in some other cases I would need to select some elements anyway, so I need a solution how to do this simple task - "select element and add class to it"</p>