How to detect all divs display style in javascript if statement?

Lets say i have 5 divs,

Div1 to div5.

They all have different display style,

sometimes 2 are none,

sometimes 2 are block.

sometimes all are none,

Sometimes all are block.

Due to the functions i set.

And i want to make a if statement that happens when all divs are style. Display= block.

Something like

If (all divs are style. Display. = block ) { something }

But i dont know how to use && for 5 divs in JavaScript if statement.

Please guide me further. Thanks!