title: Math.round() and Math.floor() problem with setInterval()
body: <p>I'm having problem with Math.round() and Math.floor() in setInterval() function by using jQuery.</p>
  
  <p>This is my code:</p>
  
  <pre><code>var number1 = 400;
  var up_up = setInterval(
  function (){
      number1 = parseFloat(number1) + parseFloat(0.2548777);
      number1 = Math.round(number1);
      $('#number1').html(number1);
  }, 1000);
  </code></pre>
  
  <p>The Math.round() or Math.floor() doesn't work, but when I use Math.ceil() it works fine, but I want round or floor..</p>
  
  <p>Please help</p>