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Creates an injector function that can be used for retrieving services as well as for dependency injection (see dependency injection).

## Usage

`angular.injector(modules);`

### Arguments

Param | Type | Details
--- | --- | ---
modules | Array.<string|Function> | A list of module functions or their aliases. See `angular.module`. The `ng` module must be explicitly added.

### Returns

function() | Injector function. See $injector.

## Example

Typical usage

      // create an injector
      var $injector = angular.injector(['ng']);

      // use the injector to kick off your application
      // use the type inference to auto inject arguments, or use implicit injection
      $injector.invoke(function($rootScope, $compile, $document){
        $compile($document)($rootScope);
        $rootScope.$digest();
      });

Sometimes you want to get access to the injector of a currently running Angular app from outside Angular. Perhaps, you want to inject and compile some markup after the application has been bootstrapped. You can do this using the extra `injector()` added to JQuery/jqLite elements. See `angular.element`.

This is fairly rare but could be the case if a third party library is injecting the markup.

In the following example a new block of HTML containing a `ng-controller` directive is added to the end of the document body by JQuery. We then compile and link it into the current AngularJS scope.

    var $div = $('<div ng-controller="MyCtrl">{{content.label}}</div>');
    $(document.body).append($div);

    angular.element(document).injector().invoke(function($compile) {
      var scope = angular.element($div).scope();
      $compile($div)(scope);
    });