我使用的是AngularJS，无法根据需要更改全局变量

angular.module('myApp').service('GlobalVariableService', function() {
  var globalVariable = {};

  return {
    get: function(key) {
      return globalVariable[key];
    },
    set: function(key, value) {
      globalVariable[key] = value;
    }
  };
});

angular.module('myApp').controller('MyController', function($scope, GlobalVariableService) {
  // 获取全局变量的值
  $scope.myVariable = GlobalVariableService.get('myVariable');

  // 设置全局变量的值
  $scope.setMyVariable = function(value) {
    GlobalVariableService.set('myVariable', value);
  };
});