From 6fa3ae6698ae318dc443c964ae1cab6f3a9f9da1 Mon Sep 17 00:00:00 2001
From: sky-admin <546485299@qq.com>
Date: Mon, 29 Apr 2019 11:23:33 +0800
Subject: [PATCH] compatible

---
 packages/webpack-plugin/lib/runtime/injectHelper.wxs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/packages/webpack-plugin/lib/runtime/injectHelper.wxs b/packages/webpack-plugin/lib/runtime/injectHelper.wxs
index 2a860a02a..e37b3b8a0 100644
--- a/packages/webpack-plugin/lib/runtime/injectHelper.wxs
+++ b/packages/webpack-plugin/lib/runtime/injectHelper.wxs
@@ -91,6 +91,7 @@ function isDef (v) {
 }
 
 function stringifyClass (value) {
+  if (value === undefined) return ''
   if (likeArray(value)) {
     return stringifyArray(value)
   }
@@ -178,6 +179,7 @@ function mergeObjectArray (arr) {
 }
 
 function normalizeDynamicStyle (value) {
+  if (value === undefined) return {}
   if (likeArray(value)) {
     return mergeObjectArray(value)
   }