JavaScript深入之new的模拟实现

废话不多说，直接上代码：

function objectFactory() {

    var obj = new Object(),

    Constructor = [].shift.call(arguments);

    obj.__proto__ = Constructor.prototype;

    var ret = Constructor.apply(obj, arguments);

    return typeof ret === 'object' ? ret : obj;

};

测试一下：

unction Person(name,age){
            this.name = name
            this.age = age
        }
        Person.prototype.drink = 'cool'
        
        function factory(){
            var obj = new Object()
            Constructor = [].shift.call(arguments)
            obj.__proto__ = Constructor.prototype
            var ret = Constructor.apply(obj,arguments)
            return typeof ret === 'object'?ret:obj
        }
        var person = factory(Person,'xiaohong',43)
        console.log(person.name)
        console.log(person.age)

结果：