Javascript - Right-click context menu (basic functionality)

//Open context menu js (how-to)
var menu = document.createElement("div");
var isOpened = false;

menu.open = function (x,y) {
   menu.style.left = x + "px"
   menu.style.top  = y + "px"
   menu.style.position = "fixed"
   menu.style.opacity = 1
   menu.style.width = "220px"
   menu.style.height = "500px"
   menu.style.backgroundColor = "#000022"
}

menu.close = function () {menu.style.opacity = 0}

showCustomMenu = function (e) {
  console.log(e)
  if (e.button == 2) {
     if (isOpened) {menu.close(), isOpened = false} else {
        isOpened = true
        menu.open(e.x, e.y)
     }

  }
}

document.body.appendChild(menu)

//NOTE: Code does just show the basics.. It's still expandable.