Download all the images on the current page.

download-image.js

var images = [],
    nodes = document.getElementsByTagName('*');
// loop over all nodes in dom
for (var x = 0, max = nodes.length; x < max; x++) {
  // look for nodes with bg imgs
  var node = nodes[x],
	image = node.style.backgroundImage;
	// if no bg img, check for img node type
	if (!image && node.nodeName === 'IMG') image = node.src;
	else image = image.replace('url("', '').replace('")', '');
	if (image && image !== 'none') {
    // dl img
		var link = window.location.href;
		// format link
		if (link.indexOf('#') !== -1) link = link.substring(0, link.indexOf('#'));
		if (image.indexOf('https://') !== -1 || image.indexOf('data:image') !== -1) link = image;
		else link += image;
		// download img
		var download = document.createElement('a');
    	download.href = link;
    	download.download = image.substr(image.lastIndexOf('/') + 1);
		download.target = '_blank';
    	document.body.appendChild(download);
    	download.click();
		// cache img link for output
		images.push(link);  
    }
}
console.log('Downloaded ' + images.length + ' images: ', images);