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代码编辑器：

<!DOCTYPE html>
<meta charset="utf-8">
<link href="/static/next/css/tryit.css?v=2017082407" rel="stylesheet"/>
<script src="https://cdn.staticfile.org/angular.js/1.6.3/angular.min.js"></script>
<h2>AngularJS 简单应用</h2>
<div ng-app = "mainApp" ng-controller = "CalcController">
   <p>输入一个数字: <input type = "number" ng-model = "number" /></p>
   <button ng-click = "square()">X<sup>2</sup></button>
   <p>结果: {{result}}</p>
</div>
<footer>简单教程，简单编程<br/>Copyright © 简单教程 www.twle.cn</footer>
<script>
   var mainApp = angular.module("mainApp", []);
   mainApp.value("defaultInput", 5);
   
   mainApp.factory('MathService', function() {
      var factory = {};
      
      factory.multiply = function(a, b) {
         return a * b;
      }
      return factory;
   });
   
   mainApp.service('CalcService', function(MathService){
      this.square = function(a) {
         return MathService.multiply(a,a);
      }
   });
   
   mainApp.controller('CalcController', function($scope, CalcService, defaultInput) {
      $scope.number = defaultInput;
      $scope.result = CalcService.square($scope.number);

$scope.square = function() {
         $scope.result = CalcService.square($scope.number);
      }
   });  
</script>

代码编辑器：

运行结果：