javascript Date() 对象返回有效但不返回 new Date()

Question

这个问题已经有答案了:

Difference between Date(dateString) and new Date(dateString) (10 个回答)

已关闭 8 年前。

变量d = Date("12:00 AM")返回日期就好了，但是当尝试创建它的实例时 new Date("12:00 AM")它返回“无效日期”。

我找到了解决方案here ，使用 moment.js，效果很好，但我想知道为什么在使用“new Date()”时会出现“无效日期”

谢谢

fiddle

Answer 1

来自 MDN:

Note: Note that JavaScript Date objects can only be instantiated by calling JavaScript Date as a constructor: calling it as a regular function (i.e. without the new operator) will return a string rather than a Date object; unlike other JavaScript object types, JavaScript Date objects have no literal syntax.

...

Invoking JavaScript Date as a function (i.e., without the new operator) will return a string representing the current date and time.

调用的第一个版本会忽略参数(并且实际上不会生成日期)。