From 36b1f19b78c450285080d741c55c9aba9c1d2bb3 Mon Sep 17 00:00:00 2001
From: btea <2356281422@qq.com>
Date: Fri, 29 Oct 2021 22:31:00 -0500
Subject: [PATCH] refactor(directives): use util method replace judge firefox
 (#4086)

---
 packages/directives/mousewheel/index.ts | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/packages/directives/mousewheel/index.ts b/packages/directives/mousewheel/index.ts
index 1c69c1906e..ef2ce55aad 100644
--- a/packages/directives/mousewheel/index.ts
+++ b/packages/directives/mousewheel/index.ts
@@ -1,18 +1,14 @@
 import normalizeWheel from 'normalize-wheel-es'
-
+import { isFirefox } from '@element-plus/utils/util'
 import type { ObjectDirective, DirectiveBinding } from 'vue'
 
-const isFirefox =
-  typeof navigator !== 'undefined' &&
-  navigator.userAgent.toLowerCase().indexOf('firefox') > -1
-
 const mousewheel = function (element, callback) {
   if (element && element.addEventListener) {
-    const fn = function (event) {
+    const fn = function (this: any, event) {
       const normalized = normalizeWheel(event)
       callback && callback.apply(this, [event, normalized])
     }
-    if (isFirefox) {
+    if (isFirefox()) {
       element.addEventListener('DOMMouseScroll', fn)
     } else {
       element.onmousewheel = fn