（obj instanceof ObjectClass）不工作？

Question

鉴于课程：

let day = new Day()

我有day instanceof Day并通过几个函数调用传递它。 但后来我用console.log(day)检查了这个对象，它返回false。 当我在Chrome中Day {_moment: Moment, year: 2016, month: 9, day: 17}时，我得到day instanceof Day。

在我使用instanceof检查之前，在控制台日志中使用Day前缀无法弄清楚为什么console.log('Day: ', day) console.log('Day: ', typeof day) console.log('Day: ', day instanceof Day) 返回false。

有什么想法吗？

编辑：

Day:  Day {_moment: Moment, year: 2016, month: 9, day: 17}
    _moment: Moment
    day: 17
    month: 9
    year: 2016
    __proto__: Object(anonymous function)
Day:  object
Day:  false

输出：

_id

Answer 1

@Bergi was correct, in one import of the Day class I wrote: import Day from '../lib/Day'

Webpack then generated another type of Day that was being used in that part of my codebase. Tip: always use lower case string on imports and require.