ionic-framework - Ionicframework 中 $window 和 window 的区别

Question

ionic 框架中 $window 和 window 之间的确切区别是什么？

例如，在 learn.ionicframework.com/formulas/localstorage/的 localstorage 教程中，同时使用了 $window 和 window。

Answer 1

$window 是一个包含全局变量 window 的 Angular 服务，主要是为了可以模拟单元测试:

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 at the source ，你会看到它背后没有更多的东西:

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