javascript - I don't understand the use of $inject in controllers -

i totally confused inject in angular. not know use , why. used factory described here?

mycontroller.$inject = ['$scope','notify'];

here notify name of factory.

that 1 approach support dependency injection after code minified (if choose minify).

when declare controller, function takes parameters:

function ($scope, notify)

when minify code, function this:

function (a, b)

since angularjs uses function parameter names infer di, code break because angularjs doesn't know a or b.

to solve problem, provided additional ways declare controllers (or other services/factories/etc) matter:

for controllers, use $inject method - here pass array of literals map parameters of controller function. so, if provide
```
['$scope', 'notify'] 
```
then value of first parameter function scope object associated controller , second parameter notify service.
when declaring new controllers, services, etc, can use array literal syntax. here, this:
```
angular.module('mymodule').controller('mycontroller', ['$scope', 'notify', function ($scope, notify) {     ... }]); 
```
the array parameter controller function maps di objects function parameters.

i prefer option #2 when declaring controllers etc easier read/understand/cross-check since in same place.

Chrom