diff --git a/packages/utils/dom.ts b/packages/utils/dom.ts
index 4ac659a8c0..c54956b70e 100644
--- a/packages/utils/dom.ts
+++ b/packages/utils/dom.ts
@@ -5,15 +5,8 @@ import type { CSSProperties } from 'vue'
 import type { Nullable } from './types'
 
 /* istanbul ignore next */
-const trimArr = function (s: string | SVGAnimatedString) {
-  if (typeof s !== 'string') {
-    if (s.baseVal) {
-      return s.baseVal.split(' ').map((item) => item.trim())
-    } else {
-      return []
-    }
-  }
-  return (s || '').split(' ').map((item) => item.trim())
+const trimArr = function (s: string) {
+  return (s || '').split(' ').filter((item) => !!item.trim())
 }
 
 /* istanbul ignore next */
@@ -56,21 +49,23 @@ export const once = function (
 }
 
 /* istanbul ignore next */
-export function hasClass(el: HTMLElement, cls: string): boolean {
+export function hasClass(el: HTMLElement | Element, cls: string): boolean {
   if (!el || !cls) return false
   if (cls.indexOf(' ') !== -1)
     throw new Error('className should not contain space.')
   if (el.classList) {
     return el.classList.contains(cls)
   } else {
-    return ` ${el.className} `.indexOf(` ${cls} `) > -1
+    const className = el.getAttribute('class') || ''
+    return className.split(' ').includes(cls)
   }
 }
 
 /* istanbul ignore next */
-export function addClass(el: HTMLElement, cls: string): void {
+export function addClass(el: HTMLElement | Element, cls: string): void {
   if (!el) return
-  const curClass = trimArr(el.className)
+  let className = el.getAttribute('class') || ''
+  const curClass = trimArr(className)
   const classes = (cls || '')
     .split(' ')
     .filter((item) => !curClass.includes(item) && !!item.trim())
@@ -78,39 +73,25 @@ export function addClass(el: HTMLElement, cls: string): void {
   if (el.classList) {
     el.classList.add(...classes)
   } else {
-    let className = el.className
-    if (typeof className === 'string') {
-      className += ` ${classes.join(' ')}`
-    } else {
-      className = `${(className as SVGAnimatedString).baseVal} ${classes.join(
-        ' '
-      )}`
-    }
+    className += ` ${classes.join(' ')}`
     el.setAttribute('class', className)
   }
 }
 
 /* istanbul ignore next */
-export function removeClass(el: HTMLElement, cls: string): void {
+export function removeClass(el: HTMLElement | Element, cls: string): void {
   if (!el || !cls) return
   const classes = trimArr(cls)
-  let curClass = el.className as string | SVGAnimatedString
-  if (typeof curClass === 'string') {
-    curClass = ` ${curClass} `
-  } else {
-    curClass = ` ${curClass.baseVal} `
-  }
+  let curClass = el.getAttribute('class') || ''
 
   if (el.classList) {
     el.classList.remove(...classes)
     return
   }
   classes.forEach((item) => {
-    curClass = (curClass as string).replace(` ${item} `, ' ')
+    curClass = curClass.replace(` ${item} `, ' ')
   })
-  const className = trimArr(curClass)
-    .filter((item) => !!item)
-    .join(' ')
+  const className = trimArr(curClass).join(' ')
   el.setAttribute('class', className)
 }
 
diff --git a/packages/utils/tests/dom.spec.ts b/packages/utils/tests/dom.spec.ts
new file mode 100644
index 0000000000..6fb1b07d9d
--- /dev/null
+++ b/packages/utils/tests/dom.spec.ts
@@ -0,0 +1,183 @@
+import { hasClass, addClass, removeClass } from '../dom'
+
+const getClass = (el: Element) => {
+  if (!el) {
+    return ''
+  }
+  return el.getAttribute('class')
+}
+
+describe('Dom Utils', () => {
+  describe('hasClass', () => {
+    it('Judge whether a Element has a class', () => {
+      const div = document.createElement('div')
+      div.className = 'a b   cc'
+      expect(hasClass(div, 'a')).toBe(true)
+      expect(hasClass(div, 'ab')).toBe(false)
+      try {
+        expect(hasClass(div, 'a b'))
+      } catch (error: any) {
+        expect(error.message).toEqual('className should not contain space.')
+      }
+
+      const canvas = document.createElement('canvas')
+      canvas.className = 'canvas-a canvas-b cc'
+      expect(hasClass(canvas, 'a')).toBe(false)
+      expect(hasClass(canvas, 'canvas-a')).toBe(true)
+      //   remove classList
+      canvas.setAttribute('classList', '')
+      expect(hasClass(canvas, 'b')).toBe(false)
+      expect(hasClass(canvas, 'canvas-b')).toBe(true)
+
+      const svg = document.createElementNS('http://www.w3.org/2000/svg', 'svg')
+      svg.setAttribute('class', 'svg-a svg-b')
+      expect(hasClass(svg, 'a')).toBe(false)
+      expect(hasClass(svg, 'svg-a')).toBe(true)
+      //   remove classList
+      svg.setAttribute('classList', '')
+      expect(hasClass(svg, 'b')).toBe(false)
+      expect(hasClass(svg, 'svg-b')).toBe(true)
+
+      const path = document.createElementNS(
+        'http://www.w3.org/2000/svg',
+        'path'
+      )
+      path.setAttribute('class', 'path-a path-b')
+      expect(hasClass(path, 'a')).toBe(false)
+      expect(hasClass(path, 'path-a')).toBe(true)
+      //   remove classList
+      path.setAttribute('classList', '')
+      expect(hasClass(path, 'b')).toBe(false)
+      expect(hasClass(path, 'path-b')).toBe(true)
+    })
+  })
+
+  describe('addClass', () => {
+    it('Add class to element', () => {
+      const div = document.createElement('div')
+      addClass(div, 'div-abc abc')
+      expect(hasClass(div, 'abc')).toBe(true)
+      expect(hasClass(div, 'div-abc')).toBe(true)
+      expect(hasClass(div, 'div')).toBe(false)
+      addClass(div, 'abc')
+      expect(getClass(div)).toEqual('div-abc abc')
+      //   remove classList
+      div.setAttribute('classList', '')
+      addClass(div, 'div-box con')
+      expect(hasClass(div, 'con')).toBe(true)
+      expect(hasClass(div, 'div-box')).toBe(true)
+      expect(hasClass(div, 'box')).toBe(false)
+      addClass(div, 'con')
+      expect(getClass(div)).toEqual('div-abc abc div-box con')
+
+      const svg = document.createElementNS('http://www.w3.org/2000/svg', 'svg')
+      addClass(svg, 'svg-abc svg')
+      expect(hasClass(svg, 'svg')).toBe(true)
+      expect(hasClass(svg, 'svg-abc')).toBe(true)
+      expect(hasClass(svg, 'abc')).toBe(false)
+      expect(hasClass(svg, 'sv')).toBe(false)
+      addClass(svg, 'svg')
+      expect(getClass(svg)).toEqual('svg-abc svg')
+      addClass(svg, 'svg-aa     space')
+      expect(getClass(svg)).toEqual('svg-abc svg svg-aa space')
+      //   remove classList
+      svg.setAttribute('classList', '')
+      addClass(svg, 'svg-abc-a svg-b')
+      expect(hasClass(svg, 'svg')).toBe(true)
+      expect(hasClass(svg, 'svg-abc')).toBe(true)
+      expect(hasClass(svg, 'abc')).toBe(false)
+      expect(hasClass(svg, 'sv')).toBe(false)
+      expect(hasClass(svg, 'svg-abc-a')).toBe(true)
+      expect(hasClass(svg, 'svg-b')).toBe(true)
+      expect(hasClass(svg, 'a')).toBe(false)
+
+      const path = document.createElementNS(
+        'http://www.w3.org/2000/svg',
+        'path'
+      )
+      addClass(path, 'path-abc path')
+      expect(hasClass(path, 'path')).toBe(true)
+      expect(hasClass(path, 'path-abc')).toBe(true)
+      expect(hasClass(path, 'abc')).toBe(false)
+      expect(hasClass(path, 'pa')).toBe(false)
+      addClass(path, 'path')
+      expect(getClass(path)).toEqual('path-abc path')
+      //   remove classList
+      path.setAttribute('classList', '')
+      expect(hasClass(path, 'path')).toBe(true)
+      expect(hasClass(path, 'path-abc')).toBe(true)
+      expect(hasClass(path, 'abc')).toBe(false)
+      expect(hasClass(path, 'pa')).toBe(false)
+    })
+  })
+
+  describe('removeClass', () => {
+    it('Remove class on element', () => {
+      const div = document.createElement('div')
+      addClass(div, 'div-abc abc ab bb cc')
+
+      removeClass(div, 'abc')
+      expect(hasClass(div, 'abc')).toBe(false)
+
+      expect(hasClass(div, 'bb')).toBe(true)
+      expect(hasClass(div, 'cc')).toBe(true)
+
+      removeClass(div, 'bb cc')
+      expect(hasClass(div, 'bb')).toBe(false)
+      expect(hasClass(div, 'cc')).toBe(false)
+      expect(getClass(div)).toEqual('div-abc ab')
+
+      //   remove classList
+      div.setAttribute('classList', '')
+      addClass(div, 'div-box con')
+      removeClass(div, 'div-box con')
+      expect(hasClass(div, 'con')).toBe(false)
+      expect(hasClass(div, 'div-box')).toBe(false)
+      expect(getClass(div)).toBe('div-abc ab')
+
+      const svg = document.createElementNS('http://www.w3.org/2000/svg', 'svg')
+      addClass(svg, 'svg-abc svg')
+      removeClass(svg, 'svg-abc     svg')
+      expect(hasClass(svg, 'svg-abc')).toBe(false)
+      expect(hasClass(svg, 'abc')).toBe(false)
+      expect(getClass(svg)).toEqual('')
+      // remove classList
+      svg.setAttribute('classList', '')
+      addClass(svg, 'svg-abc-a svg-b')
+      expect(hasClass(svg, 'svg')).toBe(false)
+      expect(hasClass(svg, 'svg-abc')).toBe(false)
+      expect(hasClass(svg, 'abc')).toBe(false)
+      expect(hasClass(svg, 'svg-abc-a')).toBe(true)
+      expect(hasClass(svg, 'svg-b')).toBe(true)
+      removeClass(svg, 'svg')
+      expect(getClass(svg)).toEqual('svg-abc-a svg-b')
+      removeClass(svg, 'svg-abc-a')
+      expect(hasClass(svg, 'svg-abc-a')).toBe(false)
+      expect(hasClass(svg, 'svg-b')).toBe(true)
+
+      const path = document.createElementNS(
+        'http://www.w3.org/2000/svg',
+        'path'
+      )
+      addClass(path, 'path-abc path')
+      expect(hasClass(path, 'path')).toBe(true)
+      expect(hasClass(path, 'path-abc')).toBe(true)
+      expect(hasClass(path, 'abc')).toBe(false)
+      expect(hasClass(path, 'pa')).toBe(false)
+      removeClass(path, 'path')
+      expect(hasClass(path, 'path')).toBe(false)
+      expect(hasClass(path, 'path-abc')).toBe(true)
+      //   remove classList
+      path.setAttribute('classList', '')
+      addClass(path, 'path path-1 path2')
+      expect(hasClass(path, 'path')).toBe(true)
+      expect(hasClass(path, 'path-1')).toBe(true)
+      expect(getClass(path)).toEqual('path-abc path path-1 path2')
+      removeClass(path, 'path')
+      expect(hasClass(path, 'path')).toBe(false)
+      expect(getClass(path)).toEqual('path-abc path-1 path2')
+      removeClass(path, 'path-abc path-1 path2')
+      expect(getClass(path)).toEqual('')
+    })
+  })
+})