How to add css class to js?

Question

css

I don't understand how to add css class .coin_icon
to var CURRENCY = " ";

Answer 1

var newDiv = document.createElement("div");
newDiv.className = "coin_icon";
newDiv.textContent = "Привет!";

Answer 2

How to learn JS? Learning plan and resources. , p.2: "top-10-functions" (p.7):

addClass() / removeClass()