From: Evan You <yyx990803@gmail.com>
Date: Thu, 18 Oct 2018 22:21:14 +0000 (-0400)
Subject: fix: watcher oldValue
X-Git-Tag: v3.0.0-alpha.0~1089
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=023f4ef7f41a8e52fa59c813f1a47582aa8aba84;p=thirdparty%2Fvuejs%2Fcore.git

fix: watcher oldValue
---

diff --git a/packages/core/src/componentWatch.ts b/packages/core/src/componentWatch.ts
index 33ceb025a0..183c230b3a 100644
--- a/packages/core/src/componentWatch.ts
+++ b/packages/core/src/componentWatch.ts
@@ -61,12 +61,12 @@ export function setupWatcher(
   const applyCb = () => {
     const newValue = runner()
     if (options.deep || newValue !== oldValue) {
-      oldValue = newValue
       try {
         cb.call(instance.$proxy, newValue, oldValue)
       } catch (e) {
         handleError(e, instance, ErrorTypes.WATCH_CALLBACK)
       }
+      oldValue = newValue
     }
   }