我们如何将以下代码转换/更改为工厂而不是服务
请在工厂和服务这两个方面实施的更好方法是什么。我是AngularJs的新手，所以请帮助我解决这个问题
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>
</head>
<body ng-app="app">
<div ng-controller="CalculatorController">
Enter a number:
<input type="number" ng-model="number" />
<button ng-click="doSquare()">X<sup>2</sup></button>
<button ng-click="doCube()">X<sup>3</sup></button>
<div>Answer: {{answer}}</div>
</div>
<script>
var app = angular.module('app', []);
app.service('MathService', function() {
this.add = function(a, b) { return a + b };
this.subtract = function(a, b) { return a - b };
this.multiply = function(a, b) { return a * b };
this.divide = function(a, b) { return a / b };
});
app.service('CalculatorService', function(MathService){
this.square = function(a) { return MathService.multiply(a,a); };
this.cube = function(a) { return MathService.multiply(a, MathService.multiply(a,a)); };
});
app.controller('CalculatorController', function($scope, CalculatorService) {
$scope.doSquare = function() {
$scope.answer = CalculatorService.square($scope.number);
}
$scope.doCube = function() {
$scope.answer = CalculatorService.cube($scope.number);
}
});
</script>
</body>
</html>
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