Imagem de fundo do estilo js por id
document.getElementById('Demo').style.backgroundImage = "url('Test.png')";
Borma
document.getElementById('Demo').style.backgroundImage = "url('Test.png')";function bg() {
var imgCount = 3;
var dir = 'http://local.statamic.com/_themes/img/';
// I changed your random generator
//floor: helps getting a random integer
var randomCount = (Math.floor(Math.random() * imgCount));
// I changed your array to the literal notation. The literal notation is preferred.
var images = ['001.png', '002.png', '003.png'];
// I changed this section to just define the style attribute the best way I know how.
document.getElementById('banner').setAttribute("style", "background-image: url(" + dir + images[randomCount] + ");background-repeat: no-repeat;background-size: 388px 388px");
}
// Don't forget to run the function instead of just defining it.
bg();