可以接收到咸鱼的订单创建连接

apps/backend/src/utils/money.js

@@ -0,0 +1,57 @@
+export function parseAmountToFen(value) {
+  const normalized = normalizeAmountInput(value)
+
+  if (!normalized) {
+    return 0
+  }
+
+  const sign = normalized.startsWith('-') ? -1 : 1
+  const unsigned = sign < 0 ? normalized.slice(1) : normalized
+  const match = unsigned.match(/^(\d+)(?:\.(\d+))?$/)
+
+  if (!match) {
+    return 0
+  }
+
+  const integerPart = Number(match[1] || '0')
+
+  if (!Number.isSafeInteger(integerPart)) {
+    return 0
+  }
+
+  const fractionRaw = String(match[2] || '')
+  const fractionForRound = `${fractionRaw}000`
+  let cents = integerPart * 100 + Number(fractionForRound.slice(0, 2))
+
+  if (Number(fractionForRound[2] || '0') >= 5) {
+    cents += 1
+  }
+
+  return cents * sign
+}
+
+export function formatFenToAmount(value) {
+  const normalizedFen = normalizeFen(value)
+  const sign = normalizedFen < 0 ? '-' : ''
+  const absoluteFen = Math.abs(normalizedFen)
+  const integerPart = Math.floor(absoluteFen / 100)
+  const fractionPart = String(absoluteFen % 100).padStart(2, '0')
+  return `${sign}${integerPart}.${fractionPart}`
+}
+
+export function normalizeFen(value) {
+  const parsed = Number(value)
+  return Number.isFinite(parsed) ? Math.round(parsed) : 0
+}
+
+function normalizeAmountInput(value) {
+  if (typeof value === 'number' && Number.isFinite(value)) {
+    return String(value)
+  }
+
+  if (typeof value !== 'string') {
+    return ''
+  }
+
+  return value.trim().replace(/,/g, '')
+}