不使用new关键字创建Object对象为什么constructor有值？

Question

var a1 = Object();var a2 = new Object();console.log(a1);console.log(a1.constructor);console.log(a2.constructor);var Person = function(){    this.name = "张三"}var b1 = new Person();var b2 = Person();console.log(b1.constructor);console.log(b2.constructor);// 出错由于b2没有使用new操作符，那么他的constructor == undefined。从理论上讲，a1.constructor也没有定义，但其可以正常返回值，为什么？与一切对象都继承自Object有关么？

Answer 1

When called in a non-constructor context, Object behaves identically to new Object().