title: How do I add commas to this Javascript counter?
body: <p>I am a beginner with JS and have no idea how to pull it off here. Idea is to have commas in the numbers to make it easier to read while counting up and also the final static result should have commas.</p>
  <p>Eg: &quot;10,000&quot;</p>
  <pre><code>var a = 0;
  $(window).scroll(function() {
  
    var oTop = $('#counter').offset().top - window.innerHeight;
    if (a == 0 &amp;&amp; $(window).scrollTop() &gt; oTop) {
      $('.counter-value').each(function() {
        var $this = $(this),
          countTo = $this.attr('data-count');
        $({
          countNum: $this.text()
        }).animate({
            countNum: countTo
          },
  
          {
  
            duration: 2000,
            easing: 'swing',
            step: function() {
              $this.text(Math.floor(this.countNum));
            },
            complete: function() {
              $this.text(this.countNum);
              //alert('finished');
            }
  
          });
      });
      a = 1;
    }
  
  });
  </code></pre>