var num=1
var string1='1'
var string2='你'
var boolean1=true
var boolean2=false
var empty=null
var unde=undefined
console.log(Number(num))
console.log(Number(string1))
console.log(Number(string2))
console.log(Number(boolean1))
console.log(Number(boolean2))
console.log(Number(empty))
console.log(Number(unde))