constructor

class Coder {
    name(val) {
        console.log(val)
        return val;
    }

    skill(val) {
        console.log(this.name('wj') + ':' + 'Skill-' + val)
    }

    // 类的参数
    constructor(a, b) {
        this.a = a
        this.b = b
    }

    add() {
        return this.a + this.b;
    }
}

let wj = new Coder(1,2);
console.log(wj.add())