web250825/ts/2.类型/2.ts

let a: object;
a = {};
a = [];
a = function () { };

/**
 * 对象：
 * {
 *     属性名:类型,
 *     属性名:类型...
 * }
 * ? 可选的
 */

let b: {
    a: number,
    c: string,
    d?: string,
    // 可以添加任意属性任意类型的属性
    [propName: string]: any
}

b = {
    a: 1,
    c: 'h',
    d: "你好",
    e: "就是",
    f: 1333
}

/**
 * 函数：
 * let c:(a:number,b:string)=> string;
 */
let c: (a: number, b: string) => string;

c = function fn1(a: number, b: string) {
    return a + b;
}

// console.log(c('12','12'))


/**
 * 数组
 * let x:类型[]
 * let x:Array<类型>
 */
let d: number[];
d = [1, 2, 3, 4];
let e: Array<boolean>
e = [true, false]

// 元祖：固定长度的数组
let f:[number,boolean,string];
f=[1,true,"12"];


// 枚举
enum Sex {
    man,woman
}
let g: {
    name:string,
    age:number,
    sex:Sex
}
g = {
    name:'图图',
    age: 3,
    sex:Sex.man
}
console.log(g.sex === Sex.woman ? '女' : '男');

// 类型别名
// 或=> |
type k = 1|2|3|4; 
let s1:k = 4;
// let s2:k = 41;

// 逻辑运算符：&
let s3:{name:string}&{age:number};
s3 = {
    name:"海绵宝宝",
    age:12
}

export { };