“Свойство данных Vue JS в компоненте должно быть функцией” Ответ

Свойство данных Vue JS в компоненте должно быть функцией

So, the reason why Vue forces the data property to be a function is that each instance of a component should have its own data object. If we don't do that, all instances will be sharing the same object and every time we change something, it will be reflected in all instances.