Detailed explanation of JavaScript reference types

Reference types are one of the very important concepts in JavaScript. It allows us to create and manipulate complex data structures such as objects, arrays and functions. This article will introduce JavaScript reference types in detail and provide corresponding source code examples.

1. Object

object is JavaScript)

Objects are the most basic reference type in JavaScript. It is an unordered collection of key-value pairs where each key is unique. Objects can be created via literal syntax or constructors.

// 使用字面量语法创建对象
let person = {
   
    
    
  name: 'John',
  age: 30,
  sayHello: function