JavaScript javascript imageslider setinterval

var imagecount = 1;
var total = 3;

I'd like to know why I can't make an imageslider this way. I have pictures saved such as studentbild1, studentbild2 and studentbild3. How do I get those to show in a setinterval like this.

window.setInterval(function slideA() {
    var image = document.getElementById('studentbild');
    imagecount = imagecount + 1;
    if(imagecount > total){ imagecount = 1;}
    if(imagecount < 1){ imagecount = total;}
    image.style.backgroundImage = 'url("studentbild" + imagecount + ".jpg")';
},1000);
Answer:1

Remove the inner double-quotes, replace them with single quotes:

image.style.backgroundImage = 'url("studentbild' + imagecount + '.jpg")';

to give

url("studentbild1.jpg")

etc.

var imagecount = 0;
var total = 3;

window.setInterval(function slideA() {
  var image = document.getElementById('studentbild');
  imagecount = imagecount + 1;
  if (imagecount > total) {
    imagecount = 1;
  }
  if (imagecount < 1) {
    imagecount = total;
  }
  image.style.backgroundImage = 'url("http://placehold.it/' + imagecount + '00")';
}, 1000);
#studentbild {
  width: 300px;
  height: 300px;
}
<div id="studentbild"></div>
Answer:2

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