TS的函数如何定义类型

如何接受arguments参数

function add(...args: string[]) {let list4: IArguments = arguments;}add('1', '2')

自定义一个args

interface A1 {callee: Function,length: number,[index: number]: any}function adds(...args: string[]) {let list4: A1 = arguments;}adds('1', '2')

多个参数

function add1(a: number, b: number): number {return a + b;}const add2 = (a: number, b: number): number => {return a + b;}

默认值

const add3 = (a: number = 10, b: number = 15): number => {return a + b;}

可选参数

const add4 = (a?: number, b?: number): void => {}

定义一个对象参数

interface User {name: string,age: number}function getName(data: User): User {return data;}

定义this参数

//ts 可以定义this 必须是第一个参数

interface Obj {list: number[],add: (this: Obj, num: number) => void}let obj: Obj = {list: [1, 2, 3, 4],add(this: Obj, num: number) {this.list.push(num);console.log(this.list)}}