title: Difference between $.ajax(); and $.ajaxSetup();
body: <p>What is the difference between <code>$.ajax();</code> and <code>$.ajaxSetup();</code> in jQuery as in:</p>
  
  <pre><code>$.ajax({
      cache:false
  });
  </code></pre>
  
  <p>and</p>
  
  <pre><code>$.ajaxSetup({
      cache:true
  });
  </code></pre>
  
  <p>Also, which one is best option?</p>