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typescript

1.let/const

    let msg:string='hello'let age:number=11let isDone:boolean=true

2.数据类型

string
number
boolean
any
void
null
undefined
never
object
array
tuple
enum

3.interface

    interface Person{name:string;age:number;sex?:string;readonly school:string;greet():void;[prop:string]:string;}let person:Person={name:'ivan',age:30}

4.联合类型与交叉类型

    let v:string|number=12type Admin=Employee&Manager

5.泛型

    function ide<T>(arg:T):T{return arg}let out=ide<number>(12)

6.类型别名

    type UserId=stringlet id:UserId='test11'

7.类型断言

let v:any='test'
let d:number=(<string>v).length
let c:number=(v as string).length

8.装饰器

    function log(value:any,constructor:any){console.log(`${constructor.name}`)}@logclass Student{constructor(){console.log('constructor')}}const s=new Student()