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