Javascript 如何从控制器调用角度服务？

我有一个角度模块，代码如下：

angular.module('sampleModule', [])

.service('myService', [function () {
    this.showAlert = function () {
        alert("Hello");
    };

    this.sum = function (a, b) {
        return a + b;
    };
}])

.controller('SampleCtrl', ['myService', '$scope', function ($scope, myService) {
    this.doSum = function () {
        var result = myService.sum(1, 2);
        alert(result);
    };
}]);

当我调用doSum时，我得到：

TypeError:myService.sum不是函数

---

有什么想法吗？谢谢

控制器DI错误-请注意参数的顺序：

.controller('SampleCtrl', ['$scope', 'myService', function ($scope, myService) {
    this.doSum = function () {
        var result = myService.sum(1, 2);
        alert(result);
    };
}]);

---

控制器DI错误-请注意参数的顺序：

.controller('SampleCtrl', ['$scope', 'myService', function ($scope, myService) {
    this.doSum = function () {
        var result = myService.sum(1, 2);
        alert(result);
    };
}]);

---

注射顺序不正确的问题$范围应该在myService之前

Correct code:
.controller('SampleCtrl', ['$scope', 'myService', function ($scope, myService) {
    this.doSum = function () {
        var result = myService.sum(1, 2);
        alert(result);
    };
}]);

---

注射顺序不正确的问题$范围应该在myService之前

Correct code:
.controller('SampleCtrl', ['$scope', 'myService', function ($scope, myService) {
    this.doSum = function () {
        var result = myService.sum(1, 2);
        alert(result);
    };
}]);

---

我怀疑顺序很重要，因为“myService”依赖于“$scope”，所以myService必须位于所需的$scope之后。这是否正确？我怀疑顺序很重要，因为“myService”依赖于“$scope”，所以myService必须位于所需的$scope之后。这是正确的吗？