title: How to get the querystring of a page with JavaScript?
body: <p>I wanna to get the query string of a page within a JavaScript block.
  for example:</p>
  
  <p>The page has a URL like <code>localhost:1234/Test/page1.aspx?ID=10</code></p>
  
  <p>How can I get '10' with JavaScript?</p>