title: How to get the class name then change the css style (Ionic)
body: <p>I'm new in ionic. I want to change css style dynamically but it always fail when I set style. My purpose is change ion-range pin context.</p>
  
  <pre><code>var className = document.getElementByClassName(".range-knob-handle .range-pin");
  element.content = "18:30";
  </code></pre>