round static method

num? round(
  1. num? value,
  2. int fractionDigits
)

按指定小数位数四舍五入

Implementation

static num? round(num? value, int fractionDigits) {
  if (value == null) return null;
  final str = value.toStringAsFixed(fractionDigits);
  return fractionDigits == 0 ? int.tryParse(str) : double.tryParse(str);
}