sda42342342423的博客

函数 1. 函数类型 let myAdd: (x: number, y: number) => number = function(x: number, y: number): number { return x + y; }; 2. 可选参数 ？ 可选参数必须跟在必须参数后面 function buildName(firstName: string, lastName?: string) { if (lastName) return firstName + " "

class 1 类的定义 class Greeter { greeting: string; constructor(message: string) { this.greeting = message; } greet() { return "Hello, " + this.greeting; } } let greeter = new Greeter("world"); 2 类的继承 super()函数： 派生类包含了一个构造函

boolean let bool:boolean = true; console.log('bool: ', bool, "type: ", typeof bool); number let num:number = 10; console.log('num: ', num, "type: ", typeof num); string let str:string = "str123"; console.log('str: ', str, "type: ", typeof str); Array&lt