元组：

let arr : [string, number] = ['hello', 3];
let arr2 : [number, boolean?] = [44];//问号可选的

let arr3 : [number, ...string[]] = [34, 'a', 'b', 'c'];//任意多个字符串，也可以没有
let arr4 : [number, ...string[]] = [34];

枚举：

//enum  数字枚举（有反向映射）
enum Direction {
	Up,
	Down,
	Left,
	Right
}
console.log(Direction.Up)

function walk(str : Direction) {
	if (str === Direction.Up) {
		console.log('上');
	} else if (str === Direction.Down) {
		console.log('下');
	} else if (str === Direction.Left) {
		console.log('左');
	} else if (str === Direction.Right) {
		console.log('右');
	} else {
		console.log('未知方向');
	}
}
walk(Direction.Down)

// enum 字符串枚举（没有反向映射）
enum Source {
	Inside = "inside",
	Outside = "outside"
}
console.log(Source);//{Inside: 'inside', Outside: 'outside'}

type：

// type
type Status = number | string; //   |管道符
type Gender = '男' | '女';

function printStatus(data : Status) : void {
	console.log(data);
}

function printGender(data : Gender) : void {
	console.log(data);
}

printStatus(200);
printStatus('200')

printGender('女')
printGender('男')

// 面积
type Area = {
	width : number;
	height : number;
}
// 地址
type Address = {
	room : number,//房间号
	cell : number | string,//单元号
}

type House = Area & Address;

const house : House = {
	width: 100,
	height: 100,
	room: 801,
	cell: 2
}