1. 数字、布尔、字符串

let num: number = 6;let str: string = "6";let bool: boolean = false;

2. 数组

// Arraylet numArr1: number[] = [4, 3, 9, 9];// 也能够利用泛型let numArr2: Array<number> = [7, 1, 3, 5];

3. 元组

元组能够进一步标准固定地位的类型，且长度不可变；

// tupplelet person1: [number, string] = [17, "aYao"]

4. Union 类型

// Unionlet uni: string | number;uni = 2;uni = "2";

5. Enum 枚举

// Enumenum Color {  red,  green,  blue}let color = Color.blueconsole.log(color) // 2

6. any

let randomVal: any = 666;randomVal = "777";randomVal = {};

7. void、undefined和never

function printResult(): void {  console.log("lalala~");}console.log(printResult()) // undefined

8. interface 与 class

interface IPoint {  x: number;  y: number;  drawPoint: () => void;  getDistances: (p: IPoint) => number;}// let drawPoint = (point: Point) => {//   console.log({ x: point.x, y: point.y });// };// drawPoint({ x: 4, y: 7 });class Point implements IPoint {  x: number;  y: number;  // 构造函数constructor； ?: 示意可选参数，能够不给其赋值  constructor(x?: number, y?: number) {    this.x = x;    this.y = y;  }  drawPoint = () => {    console.log("x:" + this.x + ",y:" + this.y);  };  getDistances = (p: IPoint) => {    return Math.pow(p.x - this.x, 2) + Math.pow(p.y - this.y, 2);  };}const point = new Point(2, 3); point.drawPoint(); // x:2,y:3

9. Generics

// 传入什么类型就返回什么类型let lastInArr = <T>(arr: Array<T>) => {  return arr[arr.length - 1];};const l1 = lastInArr([1, 2, 3, 4]); // stringconst l2 = lastInArr(["1", "2", "3", "4"]); // number// 指定类型const l3 = lastInArr<string | number>(["1", "2", "3", "4"]); // number | string