var formatDistance = function (distance) {
  if (distance < 0) {
    return "无法计算";
  }

  if (distance > 1000) {
    // 保留两位小数
    var km = (distance / 1000).toString();
    var dotIndex = km.indexOf(".");
    if (dotIndex !== -1) {
      var decimalPart = km.substring(dotIndex + 1);
      if (decimalPart.length > 2) {
        km = km.substring(0, dotIndex + 3);
      }
    }
    return km + ' <span class="txt-blue">km</span>';
  } else {
    return distance + ' <span class="txt-blue">m</span>';
  }
};

module.exports = {
  formatDistance: formatDistance,
};