how to set background image in javascript code example

Example 1: js style background image by id

document.getElementById('Demo').style.backgroundImage = "url('Test.png')";

Example 2: js background image

document.body.style.backgroundImage = "url('img_tree.png')";

Example 3: inserting a image in html backgound

<html>
  <style>
	body
      {
      background-color: url('url from web'); /* replace "url from the web" with your url*/
      }
  </style>
  <body>
    <!-- Your body displayed with the picture-->
    <h1></h1> 
  </body>  
</html>

Example 4: set an attribute background image javascript

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();

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