fix: voucher

wx-combining.html

@@ -345,7 +345,7 @@
                             let all_product_voucher = [];
 
                             new_data.product.forEach(item => {
-                                all_product_voucher.concat(item.voucher)
+                                all_product_voucher = all_product_voucher.concat(item.voucher)
                             })
 
                             console.log("all_product_voucher =>", all_product_voucher);