fix bug

@@ -177,6 +177,8 @@ export default {
           type: 'txt'
         }).show();
 
+        await this.delay(1500);
+
         this.$router.replace({
           name: 'ProductDetail',
           params: {
@@ -221,7 +223,12 @@ export default {
     },
     onNumChange(count) {
       this[Types.CHANGE_SELL_NUM](count);
-    }
+    },
+    delay(ns) {
+      return new Promise(resolve => {
+        setTimeout(resolve, ns);
+      });
+    },
   }
 };
 </script>