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ts重点学习114-装饰器笔记

灯火南山 2022-10-02 阅读 168

export default {};

/* function testDecorator(constructor: any) {
constructor.prototype.uname = "张予曦";
constructor.prototype.show = ():void => {
console.log(`我是${constructor.prototype.uname}`);

}
}


@testDecorator
class Person {

}

let p = new Person();
(p as any).show(); */

// 工厂函数
/* function testDecorator(flag: boolean) {
if(flag) {
return function (constructor: any) {
constructor.prototype.uname = "张予曦";
constructor.prototype.show = (): void => {
console.log(`我是${constructor.prototype.uname}`);
};
};
}else {
return function(constructor: any) {}
}
}

@testDecorator(true)
class Person {}

let p = new Person();
// (p as any).show(); */

// T 就相当于一个类
// 函数可以接收很多的参数,参数的类型都是any类型,最后把这些都放在了数组中
/* function testDecorator<T extends new(...args: any[]) => {}>(constructor: T) {
// 直接对 constructor 进行扩展
return class extends constructor {
name = "章若楠";
age = 18;
show() {
console.log(this.name, "xxxxxxxxxxxxxxxxxxxx");

}
}
}

@testDecorator
class Person {
name: string;
constructor(name: string) {
this.name = name
}
}


let p = new Person("陈意涵");
console.log(p);
(p as any).show() */

// 工厂函数
function testDecorator() {
return function <T extends new (...args: any[]) => {}>(constructor: T) {
return class extends constructor {
name = "章若楠";
age = 18;
show() {
console.log(this.name, "xxxxxxxxxxxxxxxxxxxx");
}
};
};
}

const Person = testDecorator()(class {
name: string;
constructor(name: string) {
this.name = name
}
})
// class Person {
// name: string;
// constructor(name: string) {
// this.name = name;
// }
// }

let p = new Person("陈意涵");
console.log(p.name);
p.show()



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