Question

我有这样的代码：

scope.people;
scope.agedPeople;

如果人们重视变化，我需要这样做：

scope.agedPeople = scope.people * 0.3;

如果老年人重视变化，我需要这样做：

scope.people = scope.agedPeople / 0.3;

我想使用$ watch，但你可以看到我有循环引用......我解决了这个问题：

    scope.checkIsPeopleCounted = function() {
      var countedPeople;

      countedPeople = scope.agedPeople * 0.3;

      return countedPeople === scope.people;
    };


    scope.checkIsAgedPeopleCounted = function() {
      var countedAgedPeople;

      countedAgedPeople = scope.people / 0.3;

      return countedAgedPeople === scope.agedPeople;
    };

    scope.$watch('people', function() {
      !scope.checkIsAgedPeopleCounted() && (scope.agedPeople = scope.people / 0.3);
    });

scope.$watch('agedPeople', function() {
  !scope.checkIsPeopleCounted() && (scope.people = scope.agedPeople * 0.3);
});

但看起来不是很好。也许有另一种解决方案？

如何以角度制作？

Answer 1

没有更多信息，它有点难。但从理论上讲，你可以像这样观察范围内的值：

$scope.$watch('agedPeople', function(newValue, oldValue){});

请参阅Scope的文档。$ watch：Angular Scope.$watch documentation。

但在你的情况下，你有一个循环引用。您可以通过向返回结果的范围添加方法来解决此问题。

var MULTIPLIER = .3;
$scope.agedPeople = 1;
$scope.people = 1;

$scope.getAgedPeople = function () {
  return $scope.people * MULTIPLIER;
};

$scope.getPeople = function () {
  return $scope.agedPeople * MULTIPLIER;
};

我希望有所帮助！

Answer 2

scope.$watch("people",function(){
    scope.agedPeople = scoped.people * 0.3;
});

对老年人来说同样的事情

当一个值更改如何更改另一个值时

2 个答案: