code: function utm(query){
    if ('?' == query.charAt(0)) query = query.substring(1);
    var query = query.replace(/\?/g, '&');
    var params = parse(query);
    var param;
    var ret = {};
  
    for (var key in params) {
      if (~key.indexOf('utm_')) {
        param = key.substr(4);
        if ('campaign' == param) param = 'name';
        ret[param] = params[key];
      }
    }
  
    return ret;
  }
docs: Get all utm params from the given `querystring`
  
  @param {String} query
  @return {Object}
  @api private