javascript - 定义自定义服务的语法

Question

我的服务在这两种情况下都按预期工作，但我不明白这两种语法之间的区别。请赐教。官方文档对这一点不是很明确。

语法 A:

service.factory('Alert',['$rootScope', '$timeout', function($rootScope, $timeout) {
  //Do stuff
}]);

语法 B:

service.factory('Alert', function($rootScope, $timeout) {
 //Do stuff 
});

Answer 1

它们都提供相同的功能，但 Syntax A(内联括号表示法)允许您的代码通过 JavaScript 压缩器进行压缩。因为 Syntax A 比 Syntax B 稍长(并且违反了 DRY 原则)，所以最合适且可能是唯一您想要使用它的情况是当您想要缩小您的代码。

Since Angular infers the controller's dependencies from the names of arguments to the controller's constructor function, if you were to minify the JavaScript code for [the] PhoneListCtrl controller, all of its function arguments would be minified as well, and the dependency injector would not be able to identify services correctly.

See this page for more information (A Note on Minification)