//1、函数重载
function hello(name:string):string
function hello(age:number):string
function hello(value : string | number): string {
if (typeof value === 'string') {
return '你好，我的名字是'+value
} else if (typeof value === 'number') {
return `你好，我的年龄是${value}`
} else {
return '非法格式'
}
}
hello(32)
hello('aidon')
//2、接口继承
interface Parent {
prop1:string
prop2:number
}
interface Child extends Parent {
prop3:string
}
const MyObj:Child = {
prop1:'',
prop2:1,
prop3:''
}
//3、类
// 类的修饰符
class Article {
public title:string //公开的 任何地方可以访问 默认给public
content:string
aaa?:string //可选
bbb = 100 //可选 默认给100 number类型
private tempDate?:string //私有的，只能在类Article内部访问
protected innerData?:string // 受保护，只能在类Article及子类中访问
static author:string //静态属性，将属性设置给类本身，而不是设置给类的实例
private static author1:string // 私有的静态属性
private static readonly author2:string= 'qqqqq' // 私有的 静态的 只读属性 不能对其在进行赋值
constructor (title:string,content:string){
this.title = title
this.content = content
}
}
const a = new Article('标题','内容')
a.aaa = '123'
a.bbb = 123
Article.author = 'qqq' // 不能a.auchor
//a.tempDate a.innerData
class Bo extends Article {
constructor (title:string,public content:string) { // 也可以在这里私有属性，但是不建议
super(title, content)
this.innerData = "123"
}
}
//4、存取器
class User {
private _password:string = "" //私有属性一般给一个下划线
get password():string { //不能读取 读取的话 给个*****
return "******"
}
set password(newPass:string){ // 可以修改重写
this._password = newPass
}
}
const u = new User()
console.log(u.password) // 不能访问_password
//5、抽象类 abstract
abstract class Animal {
abstract name: string
abstract maskSound():void
move():void {
console.log('移动');
}
}
class Cat extends Animal {
name:string = "小猫"
maskSound(): void {
}
}
//6、类实现接口
interface Animal1 {
name:string //普通的属性
get sound():string // 存储器
makeSound():void // 普通的方法
}
interface B {
age:number
}
class Dog implements Animal1,B {
name:string = '小狗'
age:number = 5
get sound(){
return ""
}
makeSound(): void {
}
}
//7、泛型类
class MyClass<T> {
public value:T
constructor (value:T) {
this.value=value
}
do (input:T):T {
console.log("处理数据",this.value);
return input
}
}
const myStr = new MyClass<string>("hello")
myStr.do("abasdf")
const myNUm = new MyClass<number>(11111)
myNUm.do(22222)
