javascript Ember.js 在哪里调用 this._super()
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Ember.js where to call this._super()
提问by Ilia Choly
I've been going through the Ember documentation and am seeing an inconsistency in where the _supermethod is being called when overriding init.
我一直在浏览 Ember 文档，发现_super在覆盖init.
This is the most common and is what I've been using so far
这是最常见的，也是我迄今为止一直在使用的
var Foo = Em.Object.extend({
init: function(){
this._super();
// ... my stuff ...
}
});
last night I was reading through this write upand saw an example doing this
昨晚我正在阅读这篇文章，看到了一个这样做的例子
var Bar = Em.Object.extend({
init: function(){
// ... my stuff ...
return this._super();
}
});
It was actually an Ember.ContainerViewin the code snippet.
它实际上是Ember.ContainerView代码片段中的一个。
Can anyone explain this? My code OCD is acting up and I can't move on until I know.
谁能解释一下？我的代码强迫症正在起作用，在我知道之前我无法继续前进。
采纳答案by hvgotcodes
In the documentation linked
在链接的文档中
init: function() {
var childViews = this.get('childViews');
var descriptionView = App.DescriptionView.create();
childViews.pushObject(descriptionView);
this.addButton();
return this._super();
},
_super()is called AFTER the descriptionView is created and pushed onto the childViewsarray.
_super()在创建 descriptionView 并将其推送到childViews数组后调用。
That's because the superclass initimplementation is going to take the childViews array and do stuff with it. If you called _superbefore adding the descriptionViewto the array, it wouldn't get processed by whatever initdoes....
那是因为超类init实现将采用 childViews 数组并用它做一些事情。如果你_super在添加descriptionView到数组之前调用它，它不会被任何东西init处理......
I'm inferring, but that's the way it works in Sproutcore, from which Ember derives, so I think it's probably the same.
我是在推断，但这就是它在 Sproutcore 中的工作方式，Ember 源自它，所以我认为它可能是相同的。
