前端 typescript

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基本变量类型

···
let isDone:boolean = false
let age:number = 20
let binaryNumber:number = 0b1111//可以是二进制

let firstName:string =‘viking’

let u:undefined = undefined
let n:null = null
let num:number = undefined
···

any类型和联合类型

···

//any 类型

let notSure:any = 4;
notSure = ‘maybe it is a string’

//联合类型
let abc :number|string = 123
abc =“Love”
···

array和tuple

//数组
let arrOfNumbers :number[] = [1,2,3,4]
//元组 限制数组里面的类型
let user:[string,number] = ['viking',1]

interface初探

1.interface主要对对象的形状进行描述
2.对类进行抽象
3.duck typing （鸭子类型）