title: Difference between .on('click') and .off('click').on('click')
body: <p>What is the use or difference of combining <code>.off</code> with <code>.click</code>?</p>
  <pre><code>$('#link').off('click').on('click',function(){});
  </code></pre>
  <p>vs.</p>
  <pre><code>$('#link').on('click',function(){});
  </code></pre>
  <p>What are the advantages of <strong>combining</strong> them?</p>