JS 数据类型

JS 基本数据类型

• boolean

let c = true
console.log(typeof c) //boolean

• number

let a = 123
console.log(typeof a) //number

• string

let a = '123'
console.log(typeof a ) //string

• undefined

let a
console.log(typeof a) //undefined
console.log(typeof b) //undefined

• null

let a = null
console.log(typeof a) //object

• symbol

let a = Symbol()
console.log(typeof a) //symbol

JS 复杂数据类型

• object

let a = {name: 'roy'}
console.log(typeof(a)) //object

let a = ['apple']
console.log(typeof a) //object