From b48bbac695dabec9160d947f9b27b2d91028c455 Mon Sep 17 00:00:00 2001
From: tangjinzhou <415800467@qq.com>
Date: Sun, 29 Jul 2018 19:33:41 +0800
Subject: [PATCH] chore: update classname

---
 components/_util/vnode.js | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/components/_util/vnode.js b/components/_util/vnode.js
index a7e40ec983..06b6235a10 100644
--- a/components/_util/vnode.js
+++ b/components/_util/vnode.js
@@ -84,13 +84,12 @@ export function cloneElement (n, nodeProps, deep) {
     style = { ...style, ...tempStyle }
   }
 
-  if (typeof data.class === 'string') {
-    cls[data.class] = true
+  if (typeof data.class === 'string' && data.class.trim() !== '') {
     data.class.split(' ').forEach(c => { cls[c.trim()] = true })
   } else {
     cls = { ...data.class, ...cls }
   }
-  if (typeof tempCls === 'string') {
+  if (typeof tempCls === 'string' && tempCls.trim() !== '') {
     tempCls.split(' ').forEach(c => { cls[c.trim()] = true })
   } else {
     cls = { ...cls, ...tempCls }