有没有办法检查插入一台计算机（JS / PHP）的屏幕数量？

I don't have code for this question. However I've been searching around trying to find a way to detect how many screens a visitor currently has. What I am trying to achieve is a JS or jQuery slideshow between 2 monitors. I am thinking the best way to go about doing this is to first find out how many screens, and the screens size.I don't have code for this question. However I'