Дмитрий Беляев

var shops = [123, 345, 567];
var types = [];

var query = {};
if(shops.length) {
  query.shops = { $in: shops };
}
if(types.length) {
  query.types = { $in: types };
}

var $form = $('#reg').serialize();
$.ajax({
  url: 'app/helper/auth.help.php',
  method: 'POST',
  data: $form,
  succes: function(data) {
    console.log(data);
  },
  error: function (xhr, status, error) {}
});

<div>
  <label><input type="checkbox" data-param="param1" class="link-changer">param 1</label>
  <label><input type="checkbox" data-param="param2" class="link-changer">param 2</label>
  <label><input type="checkbox" data-param="param3" class="link-changer">param 3</label>
  <label><input type="checkbox" data-param="param4" class="link-changer">param 4</label>
</div>
<div>
  <a href="/test" class="change-on-check">test 1</a><br>
  <a href="/test" class="change-on-check">test 2</a><br>
  <a href="/test" class="change-on-check">test 3</a><br>
</div>

var links = document.getElementsByClassName('change-on-check');
Array.prototype.forEach.call(links, function(link) {
  link.href += '?';
});
Array.prototype.forEach.call(
  document.getElementsByClassName('link-changer'),
  function(checkbox) {
    checkbox.addEventListiner('change', onChange, false);
  }
);

function onChange(event) { 
  var param = '&' + encodeURIComponent(event.target.getAttribute('data-param'));
  var add = event.target.checked;
  Array.prototype.forEach.call(links, function(link) {
    if(add) {
      link.href += param;
    } else {
      link.href = link.href.replace(param, '');
    }
  });
}

loadMember() {
  return new Promise((resolve, reject) => {
    db.query('sql...', (err, result) => {
      if(err) {
        return reject(err);
      }
      resolve(result);
    }
  }).then(result1 => {
    return new Promise((resolve, reject) => {
      //..
    });
  });
}

Promise.all([promise1, promise2 /*, ... */]).then(results => {});

document.body.innerHTML = document.body.innerHTML.replace(/слон|мышь|авто|окно/g, function(word) {
 var newWord = {
   'слон': 'печь',
   'мышь': 'мышь',
   'авто': 'мото',
   'окно': 'рама'
  }[word];
  return newWord || word;
});