From 44cf631a35603f362041e15ade2e7577e45fe02c Mon Sep 17 00:00:00 2001
From: Andy <wangpeng_hit@live.cn>
Date: Tue, 23 Oct 2018 16:32:55 +0800
Subject: [PATCH] Update delegate.js

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

diff --git a/src/delegate.js b/src/delegate.js
index 9d9397d..c43ce68 100644
--- a/src/delegate.js
+++ b/src/delegate.js
@@ -12,7 +12,8 @@ var closest = require('./closest');
  */
 function _delegate(element, selector, type, callback, useCapture) {
     var listenerFn = listener.apply(this, arguments);
-
+    
+    element.removeEventListener(type, listenerFn, useCapture); //To ensure eventListener bound once
     element.addEventListener(type, listenerFn, useCapture);
 
     return {