Javascript中的new的实现

function objectFactory() {
  const obj = new Object()

  // [].shift.call(arguments) 删除并拿到arguments的第一项
  Constructor = [].shift.call(arguments)

  obj.__proto__ = Constructor.prototype
  console.log(Constructor)

  const ret = Constructor.apply(obj, arguments)

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

console.log(objectFactory('345'))