Edit in JSFiddle

var myTween1 = new TweenMax.to('.box1', 2, {
	width:70,
  height:70,
  ease: Bounce.easeOut, x: 30,
  onComplete:myFunc,
  onCompleteParams:["{self}"],
  paused:true
});

function myFunc(ele){
	ele.reverse();
}

$('.btn1').on('click',function(){
	myTween1.resume();
})

<button type="button" class="btn1">Click!!</button>
<br><br>
<div class="box box1"></div>
<span></span>

.box{width:50px;height:50px;background-color:#000}