From: edison <daiwei521@126.com>
Date: Tue, 15 Oct 2019 15:59:40 +0000 (+0800)
Subject: refactor(reactivity): define hadKey if necessary (#288)
X-Git-Tag: v3.0.0-alpha.0~429
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=b5209277de6cf0a33afe803bfd5eb2fb600a35fe;p=thirdparty%2Fvuejs%2Fcore.git

refactor(reactivity): define hadKey if necessary (#288)
---

diff --git a/packages/reactivity/src/baseHandlers.ts b/packages/reactivity/src/baseHandlers.ts
index 005cb3ddb8..0043af73fe 100644
--- a/packages/reactivity/src/baseHandlers.ts
+++ b/packages/reactivity/src/baseHandlers.ts
@@ -38,12 +38,12 @@ function set(
   receiver: any
 ): boolean {
   value = toRaw(value)
-  const hadKey = hasOwn(target, key)
   const oldValue = target[key]
   if (isRef(oldValue) && !isRef(value)) {
     oldValue.value = value
     return true
   }
+  const hadKey = hasOwn(target, key)
   const result = Reflect.set(target, key, value, receiver)
   // don't trigger if target is something up in the prototype chain of original
   if (target === toRaw(receiver)) {