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miniprogram/src/utils/cart.ts

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+import Taro from '@tarojs/taro'
+
+const CART_KEY = 'MARKET_CART'
+
+export interface CartItem {
+  id: number
+  name: string
+  price: number
+  image: string
+  quantity: number
+  selected: boolean
+  stock: number
+  description: string
+}
+
+export const getCart = (): CartItem[] => {
+  return Taro.getStorageSync(CART_KEY) || []
+}
+
+export const setCart = (cart: CartItem[]) => {
+  Taro.setStorageSync(CART_KEY, cart)
+}
+
+export const addToCart = (product: any, quantity: number = 1) => {
+  const cart = getCart()
+  const existing = cart.find(item => item.id === product.id)
+  
+  if (existing) {
+    existing.quantity += quantity
+    if (existing.quantity > product.stock) existing.quantity = product.stock
+  } else {
+    cart.push({
+      id: product.id,
+      name: product.name,
+      price: product.price,
+      image: product.static_image_url || product.detail_image_url,
+      quantity: quantity,
+      selected: true,
+      stock: product.stock,
+      description: product.description
+    })
+  }
+  
+  setCart(cart)
+  Taro.showToast({ title: '已加入购物车', icon: 'success' })
+}
+
+export const updateQuantity = (id: number, quantity: number) => {
+  const cart = getCart()
+  const item = cart.find(i => i.id === id)
+  if (item) {
+    item.quantity = quantity
+    if (item.quantity > item.stock) item.quantity = item.stock
+    if (item.quantity < 1) item.quantity = 1
+    setCart(cart)
+  }
+  return cart
+}
+
+export const removeItem = (id: number) => {
+  const cart = getCart()
+  const newCart = cart.filter(i => i.id !== id)
+  setCart(newCart)
+  return newCart
+}
+
+export const toggleSelect = (id: number) => {
+  const cart = getCart()
+  const item = cart.find(i => i.id === id)
+  if (item) {
+    item.selected = !item.selected
+    setCart(cart)
+  }
+  return cart
+}
+
+export const toggleSelectAll = (selected: boolean) => {
+  const cart = getCart()
+  cart.forEach(item => item.selected = selected)
+  setCart(cart)
+  return cart
+}
+
+export const getSelectedItems = () => {
+  return getCart().filter(item => item.selected)
+}
+
+export const getCartCount = () => {
+  return getCart().reduce((sum, item) => sum + item.quantity, 0)
+}