export function formatYuan(v) {
  if (v == null || v === '') return '0.00'
  const n = Number(v)
  if (Number.isNaN(n)) return '0.00'
  return n.toFixed(2)
}

export function formatFenAsYuan(fen) {
  if (fen == null || Number.isNaN(fen)) return '0.00'
  return (fen / 100).toFixed(2)
}