装饰器

类装饰器

const doc:ClassDecorator = (target:any) =>{
    console.log(target)
    target.prototype.name = "meowrain";
}
@doc
class Meowrain {
    constructor(){

    }
}
const meow:any = new Meowrain();
console.log(meow.name)

属性装饰器

const doc: PropertyDecorator = (target: any, key: string | symbol) => {
    console.log(target, key)
}

class Meowrain {
    @doc
    public name: string;
    constructor() {
        this.name = "meow"
    }
}
const meow: any = new Meowrain();
console.log(meow.name)

方法装饰器

const doc: MethodDecorator = (target:any,key:string|symbol,descriptor:any) =>{
    console.log(target,key,descriptor);
}
class Xiaoman {
    public name: string;
    constructor(name:string) {
        this.name = name;
    }
    @doc
    getName(name:string,age:number) {}
}

参数装饰器

const doc: ParameterDecorator = (target: any, key: string | symbol | undefined, index: number) => {
    console.log(target, key, index);
};

class Meowrain {
    public name: string;
    constructor() {
        this.name = "meowrian";
    }
    getName(@doc name: string, @doc age: number) {
        console.log(name, age)
    }
}

装饰器实现nestjs底层GET

import axios from "axios"

const Get = (url: string) => {
    return (target: any, key: any, descriptor: any) => {
        const fnc = descriptor.value;
        const AxiosGet = async (url: string) => {
            try {
                const res = await axios.get(url);
                return fnc(res, {
                    status: 200,
                    success: true
                });
            } catch (e) {
                return fnc(e, {
                    status: 500,
                    success: false
                });
            }
        };
        AxiosGet(url);
    }
}
class Controller {
    constructor() {

    }
    @Get('https://api.apiopen.top/api/getHaoKanVideo?page=0&size=10')
    getList(res:any,status: number) {
        console.log(res.data.result.list,status)
    }

}