diff --git a/src/utils/index.ts b/src/utils/index.ts
index 64fa8c3e0..042ce3d85 100644
--- a/src/utils/index.ts
+++ b/src/utils/index.ts
@@ -85,8 +85,8 @@ export const toggleClass = (ele: HTMLElement, className: string) => {
     classString += '' + className
   } else {
     classString =
-      classString.substr(0, nameIndex) +
-      classString.substr(nameIndex + className.length)
+      classString.slice(0, nameIndex) +
+      classString.slice(nameIndex + className.length)
   }
   ele.className = classString
 }