代客下单修改，问题修复

stores/cart.js

@@ -0,0 +1,15 @@
+// stores/counter.js
+import { defineStore } from 'pinia';
+
+export const useCounterStore = defineStore('cart', {
+	state: () => {
+		return { 
+            selCoupon: [],
+         };
+	},
+	actions: {
+		setSelCoupon(coupon) {
+			this.selCoupon = coupon
+		},
+	},
+});