TypeScript笔记

TypeScript的最大特点：
1、提供了强数据类型：

变量定义：声明类型
let name:string = "你好， ts";
let num:number = 120;
let isOk:boolean = true;

let arr:number[] = [1,2,3,5];
let arr:string[] = ['1', '2'];  //数组 
let arr:any[] = ['1', 2, undefined, true];
let arr:Array<number> = [1,2,3,5];
let arr:Array<string> = ['1', '2'];
let arr:[string, number, boolean] = ['1', 2, true]; 　//元组类型

let name:string|number;　　//联合类型
let arr:number[]|string[];


函数定义：参数：声明类型，返回值：声明类型
function (name:string, age?:number):string{
    return name=="jack"? "Yes":"No";
} 

2、新增：枚举、元组、接口、命名空间、

标签：arr,TypeScript,string,number,笔记,let,true,name
来源： https://www.cnblogs.com/feiying100/p/16687907.html