JS 数组和对象的深浅克隆

 // 数组和对象的深浅克隆
    const clone = function clone() {
        let target = arguments[0],
            deep = false,
            type,
            isArray,
            isObject,
            ctor,
            result,
            treated = arguments[arguments.length - 1];
        if (typeof target === "boolean") {
            if (arguments.length === 1) return target;
            deep = target;
            target = arguments[1];
        }
        if (!Array.isArray(treated) || !treated.treated) {
            treated = [];
            treated.treated = true;
        }
        if (treated.includes(target)) return target;
        treated.push(target);
        type = toType(target);
        isArray = isArrayLike(target);
        isObject = isPlainObject(target);
        if (target == null) return target;
        ctor = target.constructor;
        if (/^(regexp|date|error)$/i.test(type)) {
            if (type === 'error') target = target.message;
            return new ctor(target);
        }
        if (/^(function|generatorfunction)$/i.test(type)) {
            return function proxy(...params) {
                return target.call(this, ...params);
            };
        }
        if (!isArray && !isObject) return target;
        result = isArray ? [] : {};
        each(target, function (copy, name) {
            if (deep) {
                result[name] = clone(deep, copy, treated);
                return;
            }
            result[name] = copy;
        });
        return result;
    };