console.log(typeof 1)

console.log(typeof ‘1‘)

console.log(typeof true)

console.log(typeof undefined)

console.log(typeof null)
VM142:1 number
VM142:3 string
VM142:5 boolean
VM142:7 undefined
VM142:9 object

console.log(typeof [1])

console.log(typeof (new Date()))

console.log(typeof /\d+/)

console.log(typeof (function(){}))
VM144:1 object
VM144:3 object
VM144:5 object
VM144:7 function

js typeof的使用