From 3209f6f517a4fa44c563cd7cc048fa29be1bc930 Mon Sep 17 00:00:00 2001
From: Evan You <yyx990803@gmail.com>
Date: Mon, 27 Mar 2017 09:49:05 +0800
Subject: [PATCH] remove parent/ref elm references when destroying instance,
 fix memory leak (fix vue-router#1279)

---
 src/core/instance/lifecycle.js | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/core/instance/lifecycle.js b/src/core/instance/lifecycle.js
index e6e0ed9629a..36ef0765f66 100644
--- a/src/core/instance/lifecycle.js
+++ b/src/core/instance/lifecycle.js
@@ -119,6 +119,9 @@ export function lifecycleMixin (Vue: Class<Component>) {
     }
     // call the last hook...
     vm._isDestroyed = true
+    // invoke destroy hooks on current rendered tree
+    vm.__patch__(vm._vnode, null)
+    // fire destroyed hook
     callHook(vm, 'destroyed')
     // turn off all instance listeners.
     vm.$off()
@@ -126,8 +129,8 @@ export function lifecycleMixin (Vue: Class<Component>) {
     if (vm.$el) {
       vm.$el.__vue__ = null
     }
-    // invoke destroy hooks on current rendered tree
-    vm.__patch__(vm._vnode, null)
+    // remove reference to DOM nodes (prevents leak)
+    vm.$options._parentElm = vm.$options._refElm = null
   }
 }