From dcc618987439a47e548f56b2b63ee71b8790d001 Mon Sep 17 00:00:00 2001
From: maxushuang <maxushuang@yeah.net>
Date: Thu, 28 Dec 2017 23:54:41 +0800
Subject: [PATCH] fix hook once

---
 src/backend/hook.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/backend/hook.js b/src/backend/hook.js
index 56de44066..91519cbf0 100644
--- a/src/backend/hook.js
+++ b/src/backend/hook.js
@@ -21,9 +21,10 @@ export function installHook (window) {
     },
 
     once (event, fn) {
+      const event_alias = event;
       event = '$' + event
       function on () {
-        this.off(event, on)
+        this.off(event_alias, on)
         fn.apply(this, arguments)
       }
       ;(listeners[event] || (listeners[event] = [])).push(on)