angularjs 指令无法获取以“-start"结尾的属性；

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我想使用 on-drag-start 作为 AngularJS 指令中的一个属性，称为 ngDraggable.
但是，似乎不可能具有该属性.

I wanted to use on-drag-start as an attribute in AngularJS directive, called ngDraggable.
However, it seems not possible to have that attribute.

以下代码是纯javascript，我可以获取on-drag-start 作为属性.我认为无论属性名称如何，我都可以获得任何属性.

The following code is in pure javascript, and I can get on-drag-start as an attribute.I think I can get any attribute regardless of attribute name.

<h1 id="tag1" on-drag-start="START" on-drag="DRAG" on-drag-end="END" >Hello Plunker!</h1>

Attributes in pure javasctipt DEMO: http://plnkr.co/edit/6iODSnf56KtwPFpoC7ck?p=preview

但是，在 AngularjS 的以下代码中，我无法获取 onDragStart 作为属性，但可以获取 onDragBegin 作为属性.

However, in the following code in AngularjS, I cannot get onDragStart as an attribute, but it is possible to get onDragBegin as an attribute.

<h1 id="tag1" ng-draggable  on-drag="DRAG" on-drag-end="END"
  on-drag-start="START" on-drag-begin="BEGIN">Hello Plunker!</h1>

Attributes in AngularJS directive DEMO: http://plnkr.co/edit/RxABAHHlxQJSSZz91CYW?p=preview

当然，我可以将我的属性名称从 on-drag-start 更改为 on-drag-begin，但我很好奇.

Of course, I can change my attribute name from on-drag-start to on-drag-begin, but I am curious.

我的问题是；

注意:我觉得我的问题格式不正确.欢迎改写.

NOTE: I feel my question is not well formatted. Rewriting is welcomed.