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miniprogram/utils/format.js

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+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)
+}
+
+/**
+ * 计量 + 单位 +（规格），如 500 克（礼盒装）；无规格时不显示括号
+ */
+export function formatMeasureUnitSpec(measureValue, unitName, spec) {
+  const unitText = (unitName || '').trim()
+  const specText = spec != null ? String(spec).trim() : ''
+
+  let base = ''
+  if (measureValue != null && measureValue !== '') {
+    const num = Number(measureValue)
+    if (!Number.isNaN(num)) {
+      const measureText = String(num).replace(/\.?0+$/, '')
+      base = unitText ? `${measureText} ${unitText}` : measureText
+    } else {
+      const measureText = String(measureValue).trim()
+      base = unitText ? `${measureText} ${unitText}` : measureText
+    }
+  } else if (unitText) {
+    base = unitText
+  } else if (!specText) {
+    return '-'
+  }
+
+  if (specText) {
+    return base ? `${base}（${specText}）` : `（${specText}）`
+  }
+  return base || '-'
+}
+
+/** 数量 × 计量单位（规格），如 10×500 克（礼盒装） */
+export function formatQtyMeasureUnitSpec(qty, measureValue, unitName, spec) {
+  const inner = formatMeasureUnitSpec(measureValue, unitName, spec)
+  if (inner === '-') return String(qty)
+  return `${qty}×${inner}`
+}