formartNum method

String formartNum(num target, int postion, { bool isCrop = false, })

Implementation

String formartNum(num target, int postion, {bool isCrop = false}) {
  String t = target.toString();
  // 如果要保留的长度小于等于0 直接返回当前字符串
  if (postion < 0) {
    return t;
  }
  if (t.contains(".")) {
    String t1 = t.split(".").last;
    if (t1.length >= postion) {
      if (isCrop) {
        // 直接裁剪
        return t.substring(0, t.length - (t1.length - postion));
      } else {
        // 四舍五入
        return target.toStringAsFixed(postion);
      }
    } else {
      // 不够位数的补相应个数的0
      String t2 = "";
      for (int i = 0; i < postion - t1.length; i++) {
        t2 += "0";
      }
      return t + t2;
    }
  } else {
    // 不含小数的部分补点和相应的0
    String t3 = postion > 0 ? "." : "";

    for (int i = 0; i < postion; i++) {
      t3 += "0";
    }
    return t + t3;
  }
}