Is bathroom moisture dangerous to laptop?

My laptop is in the same room as the bathroom is
i go to bathroom every day
my room and bathroom haven't any air vent except the door of the room which is usually closed (there are only small cracks on sides of the door)
can moisture of bathroom be dangerous to my (lenovo) laptop?

Not in the situation you're describing. It's not a good idea to keep it near your sink or shower where water might actually drip on it but as long as it's no worse than a relatively humid place might be normally, you should be fine. If it was bad enough to cause a problem you'd probably have a mold issue in your bedroom.

All moisture is bad for a laptop. Keep it in a more open and ventilated area. During showers the humidity of a bathroom will not be good for the device

Not as long as you are not in there with your laptop at the same time you are bathing or showering.

The number one enemy of electronics is water so yes, moisture is dangerous to laptops.