typescript装饰器-类装饰器

type Ctor<T> = new (...args: any[]) => T

function auto<T>(className: Ctor<T>) {
    return function (target: any, attr: any) {
        // target 是类的原型对象, attr 属性的名称 (url)
        console.log(target);
        console.log(attr);
        console.log(className)
        target[attr] = new className();
    }
}

function autoClass<T extends { new(...args: any[]): any }>(constructor: T) {
    return class extends constructor {
        name = "new property";
        age = "override";
    }
}


class Name {
    constructor() { }
    consoleMsg() {
        console.log(22222)
    }
}

@autoClass
class Greeter {
    property = "property";
    hello: string;
    name: string
    age: string

    @auto(Name)
    newProperty: Name

    constructor(hello: string) {
        this.hello = hello
    }

    getMsg() {

        this.newProperty.consoleMsg()
    }
}

let greeter = new Greeter(‘你好‘);
console.log(greeter)
console.log(greeter.name)
console.log(greeter.age)
greeter.getMsg()

function autoClassV2() {
　　// 泛型 T 继承了一个构造函数，则说明T是包含构造函数的一种类型
    return function autoClass<T extends { new(...args: any[]): any }>(constructor: T) {
        return class extends constructor {
            name = "new property";
            age = "override";
        }
    }
}
class Test {
    property = "property";
    hello: string;
    name: string
    age: string

    @auto(Name)
    newProperty: Name

    constructor(hello: string) {
        this.hello = hello
    }

    getMsg() {

        this.newProperty.consoleMsg()
    }
}
// 将装饰后的类赋值给 Test1
const Test1 = autoClassV2()(Test)

let test1 = new Test1(‘你好‘);
console.log(test1)
console.log(test1.name)
console.log(test1.age)
test1.getMsg()