我正在尝试在控制器中监听我的注入服务（自我更新）的变化。在下面的示例中，您会发现两种$watch情况 - 一种有效但我不知道确切原因，另一种对我来说很明显但不起作用。第二个例子是正确的方法吗？这不是重复代码吗？正确的方法是什么？
服务：
app.factory("StatsService", [
'$timeout', 'MockDataService',
function ($timeout, MockDataService) {
var service, timeout;
timeout = 5000;
service = {
fetch: function () {
// Getting sample data, irrelevant, however this is what updates the data
return this.data = MockDataService.shuffle();
},
grab: function () {
this.fetch();
return this.update();
},
update: function () {
var _this = this;
return $timeout(function () {
return _this.grab();
}, timeout);
}
};
service.grab();
return service;
}
]);
控制器：
app.controller("StatsController", [
'$scope', 'StatsService',
function ($scope, StatsService) {
var chart;
$scope.stats = StatsService;
$scope.test = function (newValue) {
if (arguments.length === 0) {
return StatsService.data;
}
return StatsService.data = newValue;
};
// This doesn't work
$scope.$watch('stats', function (stats) {
return console.log('meh');
});
// This works, don't know why
$scope.$watch('test()', function (stats) {
return console.log('changed');
});
}
]);