如何使用新的Apple ID更新Xcode？(How to update Xcode with a new Apple ID?)

 使用$watch来检测范围变量的任何变化。 
 
myApp.controller('MyCtrl1', ['$scope', '$http', function($scope, http) {
   console.log($scope.boolChangeClass);

   $scope.$watch(function(){
       return $scope.boolChangeClass;
   }. function() {
      console.log($scope.boolChangeClass); // will be called when the values gets changed
   })

}]);

Use $watch to detect any change in the scope variable.
 
myApp.controller('MyCtrl1', ['$scope', '$http', function($scope, http) {
   console.log($scope.boolChangeClass);

   $scope.$watch(function(){
       return $scope.boolChangeClass;
   }. function() {
      console.log($scope.boolChangeClass); // will be called when the values gets changed
   })

}]);