taoke/store/modules/cart.js

// [{
// 	seller_id: 0,
// 	seller_nickname: "店铺名称",
// 	products: [{
// 		id: 0
// 	}]
// }]

const defaults = []
const state = JSON.parse(JSON.stringify(defaults));

const getters = {
	total(state) {
		let sum = 0;
		// console.log(state)
		for (let sellerIndex in state) {
			for (let productIndex in state[sellerIndex].products) {
				if (state[sellerIndex].products[productIndex].checked) {
					sum += state[sellerIndex].products[productIndex].spec_price * state[sellerIndex].products[
						productIndex].num
				}
			}
		}
		return sum.toFixed(2);
	}

}
const mutations = {
	add(state, payload) {
		let sellerIsExist = false;
		let productIsExist = false;
		for (let sellerIndex in state) {
			if (payload.seller_id === state[sellerIndex].seller_id) {
				sellerIsExist = true;
				for (let productIndex in state[sellerIndex].products) {
					if (payload.id === state[sellerIndex].products[productIndex].id &&
						payload.spec_index === state[sellerIndex].products[productIndex].spec_index) {
						productIsExist = true;
						state[sellerIndex].products[productIndex].num = payload.num;
						break;
					}
				}

				if (!productIsExist) {
					state[sellerIndex].products.unshift(payload)
				}
				break;
			}
		}
		if (!sellerIsExist) {
			state.unshift({
				seller_id: payload.seller_id,
				seller_nickname: payload.seller_nickname,
				products: [payload],
				checked: false
			})
		}
		// console.log(this)
		this.commit("cart/save", state)
	},
	remove(state, payload) {
		for (let sellerIndex in state) {
			for (let productIndex in state[sellerIndex].products) {
				if (payload.id === state[sellerIndex].products[productIndex].id &&
					payload.spec_index === state[sellerIndex].products[productIndex].spec_index) {
					//如果商品已经存在于购物车
					state[sellerIndex].products.splice(productIndex, 1)
					if (state[sellerIndex].products.length === 0) {
						state.splice(sellerIndex, 1)
					}
				}
			}
		}
	},
	selectSeller(state, payload) {
		for (let sellerIndex in state) {
			if (payload.seller_id === state[sellerIndex].seller_id) {
				state[sellerIndex].checked = !state[sellerIndex].checked
			}
			for (let productIndex in state[sellerIndex].products) {
				if (state[sellerIndex].seller_id === payload.seller_id) {
					state[sellerIndex].products[productIndex].checked = state[sellerIndex].checked
					// this._vm.$set(state[sellerIndex].products[productIndex],"checked",state[sellerIndex].checked)
				}
			}
		}
		this.commit("cart/save", state)
	},
	selectAll(state, payload) {
		// console.log(payload)
		for (let sellerIndex in state) {
			state[sellerIndex].checked = payload.checked
			for (let productIndex in state[sellerIndex].products) {
				state[sellerIndex].products[productIndex].checked = payload.checked
			}
		}
		this.commit("cart/save", state)
	},
	select(state, payload) {
		// console.log(payload)
		for (let sellerIndex in state) {
			for (let productIndex in state[sellerIndex].products) {
				if (payload.id === state[sellerIndex].products[productIndex].id &&
					payload.spec_index === state[sellerIndex].products[productIndex].spec_index) {
					state[sellerIndex].products[productIndex].checked = !state[sellerIndex].products[productIndex]
						.checked
				}
			}
		}
		this.commit("cart/save", state)
	},
	numchange(context, payload) {
		for (let sellerIndex in state) {
			for (let productIndex in state[sellerIndex].products) {
				if (payload.id === state[sellerIndex].products[productIndex].id &&
					payload.spec_index === state[sellerIndex].products[productIndex].spec_index) {
					state[sellerIndex].products[productIndex].num = payload.num
				}
			}
		}
		this.commit("cart/save", state)

	},
	save(state) {
		uni.setStorageSync("cart", state)
	}
}
const actions = {
	add(context, payload) {
		return new Promise((resolve, reject) => {
			this._vm.$http.get({
				url: "/product",
				data: {
					id: payload.id
				},
				success: (res) => {
					// console.log(res.data.data.specs)
					const spec = JSON.parse(res.data.data.specs)[payload.specIndex];
					const data = {
						id: res.data.data.id,
						images: res.data.data.images,
						name: res.data.data.name,
						spec_index: payload.specIndex,
						spec_name: spec.name,
						spec_image: spec.image,
						spec_org_price: spec.org_price.toFixed(2),
						spec_price: spec.price.toFixed(2),
						spec_stock: spec.stock,
						seller_id: res.data.data.user_id,
						seller_nickname: res.data.data.user.nickname,
						num: payload.num,
						time: new Date().getTime(),
						checked: false
					}
					context.commit('add', data)
					resolve();
				}
			})
		})
	},
	remove(context, payload) {
		context.commit('remove', payload)
	},
	load(context) {
		let cart = uni.getStorageSync("cart");
		for (let sellerIndex in cart) {
			for (let productIndex in cart[sellerIndex].products) {
				context.dispatch("add", {
					id: cart[sellerIndex].products[productIndex].id,
					num: cart[sellerIndex].products[productIndex].num,
					specIndex: cart[sellerIndex].products[productIndex].spec_index
				})
			}
		}
	}
}

export default {
	namespaced: true,
	state,
	getters,
	actions,
	mutations
}