Ionicframework中$ window和window之间的区别 [英] Difference between $window and window in Ionicframework

问题描述

离子框架中$ window和window之间的确切区别是什么？

What is the exact difference between $window and window in ionic-framework?

例如，在learn.ionicframework.com/formulas/localstorage的localstorage教程中/ $窗口和窗口都被使用。

For example, in the localstorage tutorial at learn.ionicframework.com/formulas/localstorage/ both $window and window are used.

推荐答案

$ window 是一个包装全局变量窗口的Angular服务，主要是为了模拟它进行单元测试：

$window is an Angular service wrapping the global variable window, mainly to make it possible to mock it for unit tests:

对浏览器窗口对象的引用。虽然窗口在JavaScript中是全局可用的，但它会导致可测试性问题，因为它是一个全局变量。在角度我们总是通过$ window服务引用它，因此它可能被覆盖，删除或模拟以进行测试。

A reference to the browser's window object. While window is globally available in JavaScript, it causes testability problems, because it is a global variable. In angular we always refer to it through the $window service, so it may be overridden, removed or mocked for testing.

如果你看看来源，你'我会看到它背后没有更多：

If you look at the source, you'll see that there is not much more behind it:

function $WindowProvider() {
  this.$get = valueFn(window);
}

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