运行$ $上的应用rootScope VS任何其他范围 [英] Running $apply on $rootScope vs any other scope

问题描述

的 $适用功能可以在任何范围内运行，包括 $ rootScope 。

The $apply function can run on any scope, including $rootScope.

是否有情况下，当它使，如果我在我的本地范围内运行还是有差别，如果我上运行它，我的 $ rootScope ？

Are there cases when it makes a difference if I run it on my local scope or if I run it on my $rootScope?

我这么问是因为我想创建一个在 $适用包装给定功能的辅助函数。要做到这一点我一直需要在一个范围内，这是A）讨厌和B）不容易通过，因为我不一定有本地范围。

I'm asking because I'd like to create a helper function that wraps a given function in an $apply. To do that I'd always need to pass in a scope, which is A) annoying and B) not easy because I don't necessarily have a local scope.

我想总是有帮助我的函数调用 $适用在 $ rootScope ，但如果有一个在做一些风险。

I'd like to always have my helper function call $apply on the $rootScope, but not if there's some risk in doing that.

推荐答案

运行<​​code> $适用在任何范围内都会导致一个 $ rootscope。$摘要。它可能会有所作为的唯一情况是，当你提供一个前pression作为参数传递给 $适用。这位前pression将在当前范围内（相对于$ rootScope）进行评估，但事后 $ rootscope。$摘要是总是的所谓

Running $apply on any scope always results in a $rootscope.$digest. The only case where it might make a difference is when you provide an expression as an argument to $apply. The expression will be evaluated in the current scope (vs. $rootScope), but afterwards $rootscope.$digest is always called.

源$ C ​​$ c是相当清楚的：<一href=\"https://github.com/angular/angular.js/blob/v1.2.16/src/ng/rootScope.js#L886-L901\">rootScope.js

The source code is quite clear: rootScope.js

底线：
如果你调用 $适用不带参数，它使没有什么区别。

Bottom line: If you call $apply with no arguments, it makes no difference.

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