JS 对象和数组的创建使用new和不使用new有什么区别呢？

Question

比如：

var a = Array(); 和 var aa = new Array();
var b = Object(); 和 var bb  = new Object();

Answer 1

What is the difference between using new and not using new when creating JS objects and arrays? -PHP Chinese website Q&A-What is the difference between using new and not using new when creating JS objects and arrays? -PHP Chinese website Q&A

Let’s take a look and learn.

Answer 2

使用new的话如果函数没有return会返回一个对象。不使用new如果函数没有return会返回undefined。