Affichage des images aléatoire avec js

<!DOCTYPE html>
<html>
<head>
  <title>RÉCUPÉRER LE NOM DU FICHIER DEPUIS INPUT FILE | par NGLESSON </title>
  <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <meta name="author" content="Mezgani said">
  <meta name="copyright" content="NGLESSON">
  <link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet">
  <link href="style.css" rel="stylesheet" type="text/css">
</head>
<body>
  <div class="container">
    <div class="row mx-auto text-centermt-5">
      <div class="col-lg-4 col-12">
        <img src="https://www.nglesson.com/assets/imgs/menu/integration-web.jpg" class="img-fluid" id="attach" alt="attach" title="attach">
      </div>
    </div>
  </div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
<script src="script.js"></script>
</body>
</html>
.custom-attach-upload {
    border: 1px solid #999;
    display: inline-block;
    padding: 12px 12px;
    cursor: pointer;
    background: #ccc;
}
.custom-attach-upload:hover {
    background: #FFF;
}
//window.onload = randomImg;

window.onload = function() {
    randomImg();
};

var myFile = new Array("https://www.nglesson.com/assets/imgs/menu/solution-technique.jpg",
"https://www.nglesson.com/assets/imgs/menu/problematique.jpg",
"https://www.nglesson.com/assets/imgs/menu/cours-web.jpg");

function randomImg() {
     var randomNum = Math.floor(Math.random() * myFile.length);
     document.getElementById("attach").src = myFile[randomNum];
}
Ajouter une legende dans un formulaire

Ajouter une legende dans un formulaire

Asidebar Bootstrap4 style02

Asidebar Bootstrap4 style02

Blog post card 01

Blog post card 01

Cards box with title

Cards box with title

Carousel Bootstrap4

Carousel Bootstrap4

Footer Responsive avec Bootstrap4

Footer Responsive avec Bootstrap4

Form login with background image changed style01

Form login with background image changed style01

Image hover Inspiration styles

Image hover Inspiration styles

Scroll down button 01

Scroll down button 01

Simple Table With UIKIT

Simple Table With UIKIT

Timeline style07

Timeline style07

login page green one

login page green one