class People {
    name: string;
    age: number;
    addr: string;
    static count: number = 0;
    constructor(_name: string, _age: number, _addr: string) {
        this.name = _name;
        this.age = _age;
        this.addr = _addr;
        People.count++;
    }
    doEat(who: string, where: string) {
        console.log(`who:${who}, where:${where}`);
    }
    doStep() {}
}

class StringUtil {
    static trimSpace(str: string) {
        return str.replace(/\s+/g, '')
    }
}

// 作业 --- 通用的方法拦截器
const funcIntercepter = function(needHandleClass: any, funcName: string): void {
    const dataProp = Object.getOwnPropertyDescriptor(needHandleClass.prototype, funcName)

    const targetMethod = dataProp!.value

    dataProp!.value = function(...args: any[]) {
        args = args.map( arg => {
            if (typeof arg === 'string') return StringUtil.trimSpace(arg)
            return arg
        })
        console.log('前置拦截...');
        targetMethod.apply(this, args);     
        console.log('后置拦截...');
    }

    Object.defineProperty(needHandleClass.prototype, 'doEat', dataProp!)
}

// dataProp1?.value('王明') // 这样调用， this 就指向 dataProp1

let p = new People('lisi', 16, 'beijing');
funcIntercepter(People, 'doEat')
p.doEat('w ang wu', 's hangh ai')   // 此时 this 指向 实例 p


export {}