What is the best JavaScript code to create an img element

Question

I want to create a simple bit of JS code that creates an image element in the background and doesn\'t display anything. The image element will call a tracking URL (such as

Answer 1

This is the method I follow to create a loop of img tags or a single tag as ur wish

method1 :
    let pics=document.getElementById("pics-thumbs");
            let divholder=document.createDocumentFragment();
            for(let i=1;i<73;i++)
            {
                let img=document.createElement("img");
                img.class="img-responsive";
                img.src=`images/fun${i}.jpg`;
                divholder.appendChild(img);
            }
            pics.appendChild(divholder);

or

method2: 
let pics = document.getElementById("pics-thumbs"),
  imgArr = [];
for (let i = 1; i < 73; i++) {

  imgArr.push(``);
}
pics.innerHTML = imgArr.join('
')