安装与使用

1. 安装

   npm install -D typescript

2. 使用

   npx tsc -p apps/nav/ --watch

语法备忘

/* 标量类型 */
let name: string = "Henry";
let age: number = 25;
let sex: boolean = false;

let occupation: string;
occupation = "developer"

/* 数组类型 */
const arrayOfNumbers: number[] = []
arrayOfNumbers.push(12)

const arrayOfNumberOrString: (number|string)[] = []
arrayOfNumberOrString.push(12)
arrayOfNumberOrString.push("hello")

/* 对象类型 */
const person: {
    name: string,
    age: number,
    sex: boolean,
    // occupation: string | undefined
    occupation?: string
} = {
    name: "Henry",
    age: 25,
    sex: false
}
person.sex = true
person.occupation = "farmer"

/* 接口定义与限制选项 */
enum GENDER {
    FEMALE,
    MALE,
    NONBINARY
}
interface Person {
    name: string,
    age: number,
    sex: GENDER,
    occupation?: string
}
const person:Person = {
    name: "Henry",
    age: 25,
    sex: GENDER.MALE
}

/* 函数类型 */
const addNumber = (num: number): void => {...}