/**
 * @desc   对象序列化
 * @param  {Object} obj
 * @return {String}
 */

var stringfyQs = function stringfyQs(obj) {
  if (!obj) return '';
  var pairs = [];

  for (var key in obj) {
    var value = obj[key];
    if (value instanceof Array) {
      for (var i = 0; i < value.length; ++i) {
        pairs.push(encodeURIComponent(key + '[' + i + ']') + '=' + encodeURIComponent(value[i]));
      }
      continue;
    }
    pairs.push(encodeURIComponent(key) + '=' + encodeURIComponent(obj[key]));
  }
  return pairs.join('&');
};

module.exports = stringfyQs;