<div id="block">click me</div>
#block{
  	position:absolute;
    left: 50%;
    top: 50%;
    width: 100px;
    height: 100px;
    margin: -50px 0 0 -50px;
    background: #0c8;
    line-height: 100px;
    text-align: center;
    color: #fff;
    cursor: pointer;
    border-radius: 100%;
}
  function Animator(duration, progress, easing){
    this.duration = duration;
    this.progress = progress;
    this.easing = easing || function(p){return p};
  }
  
  Animator.prototype = {
  	start: function(finished){
      var startTime = Date.now();
      var duration = this.duration,
          self = this;
      
      requestAnimationFrame(function step(){
      	var p = (Date.now() - startTime) / duration;
        var next =  true;
        
        if(p < 1.0){
          self.progress(self.easing(p), p);
        }else{
          if(typeof finished === 'function'){
          	next = finished() === false;
          }else{
          	next = finished === false;
          }
          
          if(!next){
            self.progress(self.easing(1.0), 1.0);
          }else{
            startTime += duration;
            self.progress(self.easing(p), p);
          }
        }
        
        if(next) requestAnimationFrame(step);
      });
    }
  };
  
  function AnimationQueue(animators){
    this.animators = animators || [];
  }

  AnimationQueue.prototype = {
    status: 'ready',
    append: function(){
      var args = [].slice.call(arguments);
      this.animators.push.apply(this.animators, args);
    },
    flush: function(){
      if(this.animators.length){
        var self = this;

        function play(){
          var animator = self.animators.shift();
          
          if(animator instanceof Animator){
            animator.start(function(){
              if(self.animators.length){
                play();
              }
            });
          }else{
          	animator.apply(self);
            if(self.animators.length){
              play();
            }
          }
        }
        play();
      }
    }
  };
  
  var a1 = new Animator(2800, function(p){
    var x = -100 * Math.sin(2.8 * Math.PI * p);
    var y = 100 - 100 * Math.cos(2.8 * Math.PI * p);
    
    block.style.transform = 'translate(' + x + 'px,'
     	+ y + 'px)';
  });
  
  var a2 = new Animator(5000, function(p){
  	var x = -100 * Math.sin(2.8 * Math.PI) 
    		-100 * Math.cos(2.8 * Math.PI) * Math.PI * 5 * p;
    
    var y = 100 - 100 * Math.cos(2.8 * Math.PI) 
    		+ 100 * Math.sin(2.8 * Math.PI) * Math.PI * 5 * p;
    
    block.style.transform = 'translate(' + x + 'px,'
     	+ y + 'px)';    
  });
  
  block.addEventListener('click', function(){
	a1.start(function(){
    	a2.start();
    });
  });

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