material-shop-user/pages/tabbar/cart/cartUtils.js

const NET = require('../../../utils/request')
const API = require('../../../config/api')
import { showLoading, hideLoading } from '@/utils/plugIn/globalLoading.js'

/**
 * 根据选中的购物车数据获取价格和过滤后的用于结算购物车的post数据
 * @param dataList
 * @return {Promise<{shopList: *[], money: number}>}
 */

export async function getPriceBySelect(dataList) {
	showLoading()
	const addCart = []
	// 遍历店铺，获取选中的sku组装数据
	for (let i = 0; i < dataList.length; i++) {
		const shopObj = {}
		const theCurrentShop = dataList[i]
		shopObj.shopId = theCurrentShop.shopId
		shopObj.skus = []
		for (let j = 0; j < theCurrentShop.skus.length; j++) {
			const theCurrentSku = dataList[i].skus[j]
			// 如果是选中的才往当前店铺塞
			if (theCurrentSku.selected) {
				const skusObj = {}
				skusObj.ifLogistics = theCurrentSku.ifLogistics
				skusObj.number = theCurrentSku.number
				skusObj.selected = theCurrentSku.selected
				skusObj.skuId = theCurrentSku.skuId
				shopObj.skus.push(skusObj)
			}
		}
		// 过滤掉sku为空的店铺
		if (shopObj.skus.length > 0) {
			addCart.push(shopObj)
		}
	}
	try {
		const postData = {
			type: 2,
			shops: addCart
		}
		const res = await NET.request(API.Settlement, postData, 'POST')
		const money = res.data.shops.reduce((previousValue, currentValue) => previousValue + currentValue.total, 0)
		return {
			money: money.toFixed(2),
			shopList: addCart
		}
	} finally {
		hideLoading()
	}
}

/**
 * 根据选中的购物车数据获取购物车数量
 * @param dataList
 * @return {Promise<{allNumber: number, isAllCheck: boolean}>}
 */

export async function getCartNumberBySelect(dataList) {
	let allNumber = 0; let checkNumber = 0; let
		isAllCheck = true
	// 遍历店铺
	for (let i = 0; i < dataList.length; i++) {
		// 当前店铺
		const shopObj = dataList[i]
		// 遍历店铺内部的商品
		for (let j = 0; j < shopObj.skus.length; j++) {
			const good = dataList[i].skus[j]
			allNumber += good.number
			if (good.selected === 1) {
				checkNumber += +good.number
			} else {
				// 如果商品没有选中，但是又勾选了全选
				if (isAllCheck) {
					isAllCheck = false
				}
			}
		}
	}
	// 更新缓存
	uni.setStorageSync('allCartNum', allNumber)
	// 设置导航条
	if (allNumber > 0) {
		uni.setTabBarBadge({
			index: 2,
			text: allNumber.toString()
		})
	} else {
		uni.removeTabBarBadge({
			index: 2
		})
	}
	return {
		allNumber, checkNumber, isAllCheck
	}
}

/**
 * 默认购物车，供骨架屏使用
 * @type {[{skus: [{image: string, number: number, productId: number, price: number, productName: string, selected: number},{image: string, number: number, productId: number, price: number, productName: string, selected: number},{image: string, number: number, productId: number, price: number, productName: string, selected: number}], shopName: string, shopId: number, selected: number}]}
 */

export const defaultCartList = [
	{
		shopId: 1,
		shopName: '12312312321312312',
		selected: 0,
		skus: [
			{
				productId: 1,
				productName: '',
				image: '',
				price: 0,
				number: 0,
				selected: 0
			},
			{
				productId: 2,
				productName: '',
				image: '',
				price: 0,
				number: 0,
				selected: 0
			},
			{
				productId: 3,
				productName: '',
				image: '',
				price: 0,
				number: 0,
				selected: 0
			}
		]
	}
]