1 function Image(alt, source, width, height) {
 2   this.alt = alt;
 3   this.source = source;
 4   this.width = width;
 5   this.height = height;
 6 }
 7 
 8 var imageElements = document.getElementsByTagName("img");
 9 
10 var images = {};
11 
12 for (var i = imageElements.length - 1; i >= 0; i--) {
13   var img = imageElements[i];
14   images[i] = new Image(img.alt, img.src, img.width, img.height);
15 };
16 
17 console.table(images, ["alt", "source", "width", "height"]);