typescript基本数据类型

let name: string = 'suwei'

let age: number = 23

数字数组
let list: number[] = [1,2,3,4]
let list: Array

多样数组
let list: [string,number] = ['suwei',123]

any类型不做检查
any[]

function warn() :void {
  console.log('this is ok')
}
var isNull: void = undefined

抛错 
无限循坏 这个函数无法结束