javascript - 将数组传递给 $watchGroup 并在更改时更新数组

Question

问题:

我想将变量数组传递到 $watchGroup 并循环遍历该数组以更新每个变量的值，但这似乎不起作用:

$scope.secondsElapsed = stopWatchService.secondsElapsed;
$scope.minutesElapsed = stopWatchService.minutesElapsed;
$scope.colon = stopWatchService.colon;

$scope.timers = ['stopWatchService.secondsElapsed', 'stopWatchService.minutesElapsed', 'stopWatchService.colon'];

$scope.$watchGroup([$scope.timers], function(newValues, oldValues, scope){
    if (newValues && newValues !== oldValues){
        for (var i=0; i<newValues.length; i++){
            scope.timers[i] = newValues[i];
        }
    }
});

我目前的解决办法如下:

$scope.$watchGroup(['stopWatchService.secondsElapsed', 'stopWatchService.minutesElapsed', 'stopWatchService.colon'], function(newValues, oldValues, scope){
    scope.secondsElapsed = newValues[0];
    scope.minutesElapsed = newValues[1];
    scope.colon = newValues[2];
});

有什么想法吗？

Answer 1

您检查过$watchCollection吗？ https://docs.angularjs.org/api/ng/type/ $rootScope.Scope#$watchCollection