title: refer super context in es6 javascript
body: <p>how can I refer super context?
  Not about referencing super properties or functions.</p>
  
  <p>for example </p>
  
  <pre><code>class ParentClass {
      constructor () {}
      aFunction () {}
  }
  
  class ChildClass extends ParentClass {
      constructor () { super(); }
      aFunction () {
          super.aFunction.apply(***super***, arguments);
      }
  }
  </code></pre>