From b48c45eb7ea8d6bdf1ec805fb4ade0576670e59a Mon Sep 17 00:00:00 2001
From: Evan You <yyx990803@gmail.com>
Date: Thu, 8 Dec 2016 12:12:11 -0500
Subject: [PATCH] ensure set value last in IE9 (fix #4391)

---
 src/platforms/web/runtime/modules/attrs.js | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/platforms/web/runtime/modules/attrs.js b/src/platforms/web/runtime/modules/attrs.js
index 12d3aa02..cc3d695c 100644
--- a/src/platforms/web/runtime/modules/attrs.js
+++ b/src/platforms/web/runtime/modules/attrs.js
@@ -1,6 +1,7 @@
 /* @flow */
 
 import { extend } from 'shared/util'
+import { isIE9 } from 'core/util/env'
 import {
   isBooleanAttr,
   isEnumeratedAttr,
@@ -17,7 +18,7 @@ function updateAttrs (oldVnode: VNodeWithData, vnode: VNodeWithData) {
   let key, cur, old
   const elm = vnode.elm
   const oldAttrs = oldVnode.data.attrs || {}
-  let attrs = vnode.data.attrs || {}
+  let attrs: any = vnode.data.attrs || {}
   // clone observed objects, as the user probably wants to mutate it
   if (attrs.__ob__) {
     attrs = vnode.data.attrs = extend({}, attrs)
@@ -30,6 +31,10 @@ function updateAttrs (oldVnode: VNodeWithData, vnode: VNodeWithData) {
       setAttr(elm, key, cur)
     }
   }
+  // #4391: in IE9, setting type can reset value for input[type=radio]
+  if (isIE9 && attrs.value !== oldAttrs.value) {
+    setAttr(elm, 'value', attrs.value)
+  }
   for (key in oldAttrs) {
     if (attrs[key] == null) {
       if (isXlink(key)) {