Simple timer (for a friend)

index.html

<button type='button'
        id="startTimer"
        class='btn btn-primary'>start timer</button>
<button type='button'
        id='stopTimer'
        class='btn btn-danger hide'>stop timer</button>

script.js

$(function(){
	var miliseconds = 1000,
      interval = null,
      $startTimer = $('#startTimer'),
      $stopTimer = $('#stopTimer');

  $startTimer.on('click', onStartClick);
  $stopTimer.on('click', onStopClick);
  
  function doSomething(){
    $('body').append('blah');
  }

  function startTimer(){
    interval = setInterval(doSomething, miliseconds);
  }

  function stopTimer(){
    if(interval){
      clearInterval(interval);
    }
  }

  function onStartClick(e){
		$stopTimer.removeClass('hide');
    $startTimer.addClass('hide');
    startTimer();
  }  
  
  function onStopClick(e){		
    $startTimer.removeClass('hide');
    $stopTimer.addClass('hide');
    stopTimer();
  }
});