typescript语法

typescript

1.let/const

    let msg:string='hello'
    let age:number=11
    let 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=12
    type 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=string
    let 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}`)
    }
    @log
    class Student{
        constructor(){
            console.log('constructor')
        }
    }
    const s=new Student()