ts是javascript的超级，ts类型分为两大类：基础类型和引用类型
基本数据类型
1.boolean
let bool:boolean = false
2.string
let str:string = "str"
3.number
let numb:number = 123
4.tuple 元组
let rup:[string,number,boolean] = ["123",123,true]
5.enum 枚举
enum path { login = "/login", menu = "/menu" }
6.void
function func():void{ console.log(123) }
7.any
let an:any = 123 an = true an = "132"
8.null
let nu:null = null
9.undefined
let un:undefined = undefined
10.nerver 类型
let a:never a = 123456 a = (()=>{ throw new Error() })
引用数据类型
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array const arr:string[] = ["123","456"]
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object const obj1:object = { name:"zhangsan" }
