window.fetch(), queue_len=5

// window.fetch(), queue_len=5
var page = 1, pages = 1E3, ql = 1, maxql = 5, pageu = 1, photos = [];
call1(page);
function call1(page) {
  fetch("https://api.500px.com/v1/photos/?feature=popular&rpp=100&tags=1&image_size=3,4,2048&consumer_key=cGxWLkAk4zp6XK8mkz95UR7ksy17FsEPo8VfXBCm&page=" + page).then(function(response) {
    return response.json();
  }).then(function(v) {
    console.log(v);
    photos = photos.concat(v.photos);
    ql--;
    v.total_pages && v.total_pages < 1E3 && (pages = v.total_pages);
    while (pageu < pages && ql < maxql) {
      pageu++;
      ql++;
      call1(pageu);
    }
  });
}
;