title: Using javascript to check if a querystring has a value
body: <p>New in JS, How do I check if one of my querystring has a value?</p>
  
  <p>Example: I have result.aspx?loc=3. How do I check this in javascript if my querystring loc has a value. I need to do this because I will use $('#target').css({'display':'none'});  to a certain div</p>