Is this to be trusted?

I have been browsing on a website for videos to watch when another web popped up before the web I was looking at. It sounded alarm and told me not to even try to close that tab. It also illustrated how my Mac was hacked by accessing a certain IP address. Do anyone have the same experience? I was confused so I can only force restart Chrome. Hope someone can tell me how to deal with this problem.There's several pages of these, and I have no idea how they got there cuz I haven't reload that page for even once.