Constructor invocation without parentheses [duplicate]

问题

This question already has answers here:

Can we omit parentheses when creating an object using the “new” operator? (6 answers)

Closed 5 years ago.

Is there any difference between

var obj1 = new Constructor;

and

var obj2 = new Constructor();

given that Constructor is a constructor function?

回答1:

According to the MDN docs:

[...] "new foo" is equivalent to "new foo()", i.e. if no argument list is specified, "foo" is called without arguments.

来源：https://stackoverflow.com/questions/11347046/constructor-invocation-without-parentheses