From cde441fb79b0789cf851659c9dbe3a85942d36d4 Mon Sep 17 00:00:00 2001
From: fw6 <45113594+fw6@users.noreply.github.com>
Date: Thu, 24 Jun 2021 15:51:35 +0800
Subject: [PATCH] fix(utils.dom): fix utils.dom error (#21049)

In IE browser, If the reference element(slot="reference") under the popover component is a SVG element, an error will be reported.

[#21048](https://github.com/ElemeFE/element/issues/21048)
---
 src/utils/dom.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/utils/dom.js b/src/utils/dom.js
index bb4c05c80..a88df3242 100644
--- a/src/utils/dom.js
+++ b/src/utils/dom.js
@@ -91,7 +91,7 @@ export function addClass(el, cls) {
     }
   }
   if (!el.classList) {
-    el.className = curClass;
+    el.setAttribute('class', curClass);
   }
 };
 
@@ -112,7 +112,7 @@ export function removeClass(el, cls) {
     }
   }
   if (!el.classList) {
-    el.className = trim(curClass);
+    el.setAttribute('class', trim(curClass));
   }
 };