setFullScreen.js

setFullScreen = ($elm, width, height) => {
  let resize_width = 0;
  let resize_height = 0;
  let margin = [];
  if (window.innerWidth / window.innerHeight > width / height) {
    resize_width = window.innerWidth;
    resize_height = height * (window.innerWidth / width);
    let over = (window.innerHeight - resize_height) / 2;
    margin = [over, 0, over, 0];
  } else {
    resize_width = width * (window.innerHeight / height);
    resize_height = window.innerHeight;
    let over = (window.innerWidth - resize_width) / 2;
    margin = [0, over, 0, over];
  }
  $elm.css({
    width: resize_width,
    height: resize_height,
    marginTop: margin[0],
    marginRight: margin[1],
    marginBottom: margin[2],
    marginLeft: margin[3],
  });
}