title: How to get the optional query parameters in Angular2?
body: <p>Here is the URL that I want to handle
  <a href="http://localhost/?id=120&amp;lang=en&amp;search=abc" rel="nofollow">http://localhost/?id=120&amp;lang=en&amp;search=abc</a></p>
  
  <p>How can I read these parameters (id, lang and search).</p>