<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;
}

  block.addEventListener('click', function(){
    var self = this, startTime = Date.now(),
        disX = 200, disY = 200, 
        duration = 1000 * Math.sqrt(2 * disY / 98); 
    	//假设10px是1米，disY = 20米
    
  	requestAnimationFrame(function step(){
      var p = Math.min(1.0, (Date.now() - startTime) / duration);
      var tx = disX * p;
      var ty = disY * p * p;
      
      self.style.transform = 'translate(' 
        + tx + 'px' + ',' + ty +'px)';
      if(p < 1.0) requestAnimationFrame(step);
    });
  });