之间有什么$范围。$根$ rootScope区别？ [英] What is the difference between $scope.$root and $rootScope?

问题描述

我控制器看到$范围有$根，这是什么？它是如何从$ rootScope不同，可在控制器注入？

I see in controllers that $scope has $root, what is this? How is it different from $rootScope which can be injected in the controller?

推荐答案

$ rootScope VAR指向所有范围的父母和随处注入。所有其他的范围是的 $ rootScope 的孩子。它们通过的 $新的方法创建的 $ rootScope 因此，每一个范围继承的 $ rootScope 。

$rootScope var which points to the parent of all the scopes and can be injected everywhere. All other scopes are children of the $rootScope. They are created via the $new method of the $rootScope thus every scope inherits from the $rootScope.

在范围构造<定义角源href=\"https://github.com/angular/angular.js/blob/d7ecab775ceefcd55a23780d005ce1c39cd8651b/src/ng/rootScope.js#L130\">there是行：

 function Scope() {
   this.$id = nextUid();
 ...
 this['this'] = this.$root =  this;
 ...

看来 $根 VAR仅仅是的占位符该创建的第一个范围 - $ rootScope 。

It seems the $root var is just a placeholder for this of the first scope created - $rootScope.

接下来是<一个href=\"https://github.com/angular/angular.js/blob/d7ecab775ceefcd55a23780d005ce1c39cd8651b/src/ng/rootScope.js#L180\">this一块在 $新的方法code 的：

Next there is this piece of code in the $new method:

  $new: function(isolate) {
      ...

    if (isolate) {
      child = new Scope();
      child.$root = this.$root;
   ...
   return child;

所以 $ rootScope 的每一个范畴孩子的 $根 VAR是 $ rootScope 。而这些孩子的所有孩子会得到同样的参考 $ rootScope

So the $root var of every scope child of $rootScope is a reference to $rootScope. And all the children of those children will get the same reference to $rootScope

在我看来，这是更好地通过依赖注入使用 $ rootScope ，因为它是一个明确的和整体更为常用参照 $ rootScope

In my opinion it is better to use the $rootScope via dependency injection because it is an explicit and overall more frequently used way of referring to the $rootScope

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