From 0f4d38bcf340f67b5135edf715e218748cd77a65 Mon Sep 17 00:00:00 2001
From: HcySunYang <HcySunYang@outlook.com>
Date: Sat, 29 May 2021 12:57:28 +0800
Subject: [PATCH] fix(runtime-dom): only set selectedIndex when the value
 changes

---
 packages/runtime-dom/src/directives/vModel.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/packages/runtime-dom/src/directives/vModel.ts b/packages/runtime-dom/src/directives/vModel.ts
index a90c4466a17..f63f909b3c6 100644
--- a/packages/runtime-dom/src/directives/vModel.ts
+++ b/packages/runtime-dom/src/directives/vModel.ts
@@ -224,12 +224,12 @@ function setSelected(el: HTMLSelectElement, value: any) {
       }
     } else {
       if (looseEqual(getValue(option), value)) {
-        el.selectedIndex = i
+        if (el.selectedIndex !== i) el.selectedIndex = i
         return
       }
     }
   }
-  if (!isMultiple) {
+  if (!isMultiple && el.selectedIndex !== -1) {
     el.selectedIndex = -1
   }
 }