Get Element Using Class Name

 let smallImages=document.getElementsByClassName("oldImg");

console.log(smallImages);
console.dir(smallImages);
for(let i=0;i<smallImages.length;i++){
    console.dir(smallImages[i]);
    console.dir(smallImages[i].src);
    smallImages[i].src="assets/spiderman_img.png";
    console.log(`image ${i} has changed`);

}

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