Javascript 获取阻力&；下降位置

我使用angular js dragula进行拖放

我需要保存位置，因为用户选择自定义div位置。 这就是我的html的外观

<div class='wrapper'>
  <div class='container' dragula='"first-bag"'>
    <div>You can move these elements between these two containers</div>
    <div>Moving them anywhere else isn't quite possible</div>
    <div>There's also the possibility of moving elements around in the same container, changing their position</div>
  </div>
</div>

这是plunker，打开控制台看看会发生什么。 请，如果有人知道如何在每个拖放保存div命令，所以下次当用户回来获得保存的位置。Thnx

$scope.$on('first-bag.over', function (e, el) {
  el.addClass('over');
  console.log(e);
  console.log(el);
})

$scope.$on('first-bag.out', function (e, el) {
  el.removeClass('over');
  console.log(e);
  console.log(el);
});