W250511/15.ts/2.类型/2.ts

// object (数组 对象 函数)

// Array 数组
// let a = [];
let aa:number[] = [1,2,3];
let bb:string[];
bb = ['1','2','3'];
let cc:Array<boolean>;
cc = [true,false,true];

// Tuple 元组:固定长度的数组
let dd:[string,number,boolean];
dd = ['str',123,true];

// Object 对象
let ee:object;
ee = {};
ee = function(){};
ee = [];
let ff:{
    name:string,
    age:number,
    sex:string,
    address?:string ,// 可选属性
    [propName:string]:any // 任意属性
}

ff = {
    name:'张三',
    age:18,
    sex: '男',
    address:'北京',
    eat:'苹果',
    book:'书籍' 
}

// ff = {
//     name:'张三',
//     age:18,
//     sex: '男',
// }

// 函数类型
function fn4():void {
    console.log('fn4');
}
fn4();


function fn5(a:number,b:string):string {
    // console.log('fn5');
    return a + b;
}
fn5(3,'45');

let fn6:(a:number,b:number)=>number;
fn6 = function(x,y) {
    return x + y;
}
fn6(12,34);

// 枚举 enum
enum Sex1 {
    man,woman
}

let kk: {
    name:string,
    age:number,
    sex: Sex1
}

kk = {
    name:'李四',
    age:20,
    sex: Sex1.man
}

console.log(kk.sex === Sex1.man ? '男' : '女');
// type 声明的内容 更侧重于 类型的重复使用 支持联合类型和交叉类型
// 联合类型
// 类型别名
type myType = string | number | boolean;
let ww:myType;
ww = 'hello';
ww = 123;
ww = true;

type myType2 = {
    name:string,
    age:number 
}
let zz:myType2;
zz = {
    name:'赵六',
    age:22
}

// & 交叉类型 
let oo: {
    name:string
} & {
    age?:number
}

oo = {
    name:'王五',
    age:18
}