How to determine item being added/removed to an observed array in ember?

问题

It explains here how to observe items in an array with ember. My question is how can I determine the item being added/removed with this method?

回答1:

You can use the addArrayObserver method to find items added/removed from an array.

The code will look something like this

that.get('content').addArrayObserver(this, {
  willChange: Ember.K,
  didChange: function(array, start, removeCount, addCount) {
    alert(array[start]);
  }
});

More information can be found here.

Here is a link to a working demo.

来源：https://stackoverflow.com/questions/30011028/how-to-determine-item-being-added-removed-to-an-observed-array-in-ember