原生JS手写new方法

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function Parent() {
    this.name = "parent";
    this.say = function() {
        console.log("say")
    }
}

Parent.prototype = {
    walk: function() {
        console.log("walk")
    }
}

function newfn(fn) {
    if (typeof fn !== 'function') return;
    let son = {};
    fn.call(son);
    fn.prototype.constructor = fn;
    son.__proto__ = fn.prototype;
    return son;
}
let son1 = newfn(Parent);
son1.walk();