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const isComplexDataType = obj => (typeof obj === 'object' || typeof obj === 'function') && obj !== null

const selfNew = function (fn, ...rest) {

let instance = Object.create(fn.prototype)

let res = fn.call(instance, ...rest)

return isComplexDataType(res) ? res : instance

}

function Person(name, sex) {

this.name = name

this.sex = sex

}

let newPerson = new Person('zhl', 'male')

let selfNewPerson = selfNew(Person, 'zhl', 'male')

console.log(newPerson)

console.log(selfNewPerson)