如何使用angularjs指令中的内置服务?

var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope, $location, YourService) { // injections are important 
  $scope.uid = $location.path().substring($location.path().lastIndexOf('/') + 1);
  $scope.log = function() {
    YourService.callToTheService($scope.uid);
  }
});

app.service("YourService", function() {
  this.callToTheService = function(uid) {
    console.log("UID: ",uid); // empty in this case
  }
})

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.4/angular.min.js"></script>

<div ng-app="myApp" ng-controller="myCtrl">
  <button ng-click="log()">Log UID</button>
</div>