问题描述
AngularJS开发人员表达式指南提到了一个名为$locals的东西:
AngularJS Developer Guide on Expressions mentions something named $locals:
我不知道什么是本地对象"，也无法在文档中找到有关$ locals的更多信息.目的是什么?您如何操作呢?
I don't understand what "locals object" is and I can't find any more info on $locals in docs. What is it's purpose? How do you operate on it?
推荐答案
在其中找到有关其更多信息的相关提交是此，它也链接到要求引入$ locals的问题.
The relevant commit where to find more information about it is this one, which also links to the issue asking to introduce $locals.
简而言之，当使用'&'将参数传递给指令时，为了使指令能够在需要时执行某些代码(例如，当您使用ng-click="doSomething()"时)，指令可以将信息传递给使用本地值的呼叫者.
In short, when passing a parameter to a directive using '&', in order for the directive to be able to execute some code when needed (for example when you use ng-click="doSomething()"), the directive can pass information to the caller using local values.
例如，您可以使用ng-click="doSomething($event)"，其中$ event不是作用域的属性，而是ng-click指令传递的值.
For example you can use ng-click="doSomething($event)", where $event is not an attribute of the scope, but a value passed by the ng-click directive.
您可以使用$locals一次访问所有这些指令，而不必分别访问该指令传递的每个本地"值.
Instead of accessing each "local" value passed by the directive individually, you can have access to all of them at once using $locals.
(重点是我的)
在上述示例中，使用$ locals可以使用该指令传递的整个对象{amount: 22}，因此可以使用increment($locals.amount)
In the above axample, the entire object {amount: 22} passed by the directive is available using $locals, and you could thus use increment($locals.amount)
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