Descarga de img

images = document.getElementsByClassName('listado');
window.srcImages = []
i = 0;
setInterval(function(){
   if(images.length > i){
        src = images[i].getElementsByTagName("img")[0].src;
       img = new Image();
       img.src = src.replace("-t","");
       if( img.height != 0 )
            src = src.replace("-t","");

        ext = src.split(".");
        ext = ext[ ext.length - 1 ];
        title = images[i].getElementsByTagName( "a" )[0].textContent;
        srcImages.push(src)
        var link = document.createElement("a");
       link.id=i;
       link.download = `${title}.${ext}`;
       link.href = src;
       link.click();
       i++;
   }
},500);