diff --git a/src/button/index.tsx b/src/button/index.tsx
index b130f3fe4..6d43b461a 100644
--- a/src/button/index.tsx
+++ b/src/button/index.tsx
@@ -124,7 +124,7 @@ export default createComponent({
         }
 
         // hide border when color is linear-gradient
-        if (color.indexOf('gradient') !== -1) {
+        if (color.includes('gradient')) {
           style.border = 0;
         } else {
           style.borderColor = color;
diff --git a/src/cascader/index.tsx b/src/cascader/index.tsx
index 547dd9abb..6e10b74a4 100644
--- a/src/cascader/index.tsx
+++ b/src/cascader/index.tsx
@@ -252,7 +252,7 @@ export default createComponent({
           const values = state.tabs.map(
             (tab) => tab.selectedOption?.[valueKey]
           );
-          if (values.indexOf(value) !== -1) {
+          if (values.includes(value)) {
             return;
           }
         }
diff --git a/src/checkbox/index.tsx b/src/checkbox/index.tsx
index f63e50ad0..de8341ed7 100644
--- a/src/checkbox/index.tsx
+++ b/src/checkbox/index.tsx
@@ -36,7 +36,7 @@ export default createComponent({
       if (checked) {
         const overlimit = max && value.length >= max;
 
-        if (!overlimit && value.indexOf(name) === -1) {
+        if (!overlimit && !value.includes(name)) {
           value.push(name);
 
           if (props.bindGroup) {
diff --git a/src/collapse/index.tsx b/src/collapse/index.tsx
index a5b0237be..cbefdf1b2 100644
--- a/src/collapse/index.tsx
+++ b/src/collapse/index.tsx
@@ -73,7 +73,7 @@ export default createComponent({
 
       return accordion
         ? modelValue === name
-        : (modelValue as Array<number | string>).indexOf(name) !== -1;
+        : (modelValue as Array<number | string>).includes(name);
     };
 
     linkChildren({ toggle, isExpanded });
diff --git a/src/count-down/utils.ts b/src/count-down/utils.ts
index ce66f1fbb..772032dac 100644
--- a/src/count-down/utils.ts
+++ b/src/count-down/utils.ts
@@ -5,36 +5,36 @@ export function parseFormat(format: string, currentTime: CurrentTime): string {
   const { days } = currentTime;
   let { hours, minutes, seconds, milliseconds } = currentTime;
 
-  if (format.indexOf('DD') === -1) {
-    hours += days * 24;
-  } else {
+  if (format.includes('DD')) {
     format = format.replace('DD', padZero(days));
+  } else {
+    hours += days * 24;
   }
 
-  if (format.indexOf('HH') === -1) {
-    minutes += hours * 60;
-  } else {
+  if (format.includes('HH')) {
     format = format.replace('HH', padZero(hours));
+  } else {
+    minutes += hours * 60;
   }
 
-  if (format.indexOf('mm') === -1) {
-    seconds += minutes * 60;
-  } else {
+  if (format.includes('mm')) {
     format = format.replace('mm', padZero(minutes));
-  }
-
-  if (format.indexOf('ss') === -1) {
-    milliseconds += seconds * 1000;
   } else {
-    format = format.replace('ss', padZero(seconds));
+    seconds += minutes * 60;
   }
 
-  if (format.indexOf('S') !== -1) {
+  if (format.includes('ss')) {
+    format = format.replace('ss', padZero(seconds));
+  } else {
+    milliseconds += seconds * 1000;
+  }
+
+  if (format.includes('S')) {
     const ms = padZero(milliseconds, 3);
 
-    if (format.indexOf('SSS') !== -1) {
+    if (format.includes('SSS')) {
       format = format.replace('SSS', ms);
-    } else if (format.indexOf('SS') !== -1) {
+    } else if (format.includes('SS')) {
       format = format.replace('SS', ms.slice(0, 2));
     } else {
       format = format.replace('S', ms.charAt(0));
diff --git a/src/empty/index.tsx b/src/empty/index.tsx
index 520f5ee7d..e32c0335b 100644
--- a/src/empty/index.tsx
+++ b/src/empty/index.tsx
@@ -27,7 +27,7 @@ export default createComponent({
         return Network;
       }
 
-      if (PRESET_IMAGES.indexOf(image) !== -1) {
+      if (PRESET_IMAGES.includes(image)) {
         image = `https://img01.yzcdn.cn/vant/empty-image-${image}.png`;
       }
 
diff --git a/src/form/index.tsx b/src/form/index.tsx
index c022baee0..82fe71824 100644
--- a/src/form/index.tsx
+++ b/src/form/index.tsx
@@ -50,7 +50,7 @@ export default createComponent({
 
     const getFieldsByNames = (names?: string[]) => {
       if (names) {
-        return children.filter((field) => names.indexOf(field.name) !== -1);
+        return children.filter((field) => names.includes(field.name));
       }
       return children;
     };
diff --git a/src/icon/index.tsx b/src/icon/index.tsx
index 82849f5bb..3e65ca84e 100644
--- a/src/icon/index.tsx
+++ b/src/icon/index.tsx
@@ -5,7 +5,7 @@ import Badge from '../badge';
 const [createComponent, bem] = createNamespace('icon');
 
 function isImage(name?: string) {
-  return name ? name.indexOf('/') !== -1 : false;
+  return name ? name.includes('/') : false;
 }
 
 export default createComponent({
diff --git a/src/pull-refresh/index.tsx b/src/pull-refresh/index.tsx
index a3b51c80b..45b9b4c54 100644
--- a/src/pull-refresh/index.tsx
+++ b/src/pull-refresh/index.tsx
@@ -121,7 +121,7 @@ export default createComponent({
 
       const nodes = [];
 
-      if (TEXT_STATUS.indexOf(status) !== -1) {
+      if (TEXT_STATUS.includes(status)) {
         nodes.push(<div class={bem('text')}>{getStatusText()}</div>);
       }
       if (status === 'loading') {
diff --git a/src/share-sheet/index.tsx b/src/share-sheet/index.tsx
index 541063de0..d3ade3033 100644
--- a/src/share-sheet/index.tsx
+++ b/src/share-sheet/index.tsx
@@ -34,7 +34,7 @@ const popupKeys = [
 ] as const;
 
 function getIconURL(icon: string) {
-  if (PRESET_ICONS.indexOf(icon) !== -1) {
+  if (PRESET_ICONS.includes(icon)) {
     return `https://img01.yzcdn.cn/vant/share-sheet-${icon}.png`;
   }
   return icon;
diff --git a/src/stepper/index.tsx b/src/stepper/index.tsx
index 74d84df47..3653c42d1 100644
--- a/src/stepper/index.tsx
+++ b/src/stepper/index.tsx
@@ -190,7 +190,7 @@ export default createComponent({
       let formatted = formatNumber(String(value), !props.integer);
 
       // limit max decimal length
-      if (isDef(decimalLength) && formatted.indexOf('.') !== -1) {
+      if (isDef(decimalLength) && formatted.includes('.')) {
         const pair = formatted.split('.');
         formatted = `${pair[0]}.${pair[1].slice(0, +decimalLength)}`;
       }
diff --git a/src/tree-select/index.tsx b/src/tree-select/index.tsx
index abedfef3e..9134e1fd1 100644
--- a/src/tree-select/index.tsx
+++ b/src/tree-select/index.tsx
@@ -65,7 +65,7 @@ export default createComponent({
   setup(props, { emit, slots }) {
     const isActiveItem = (id: number | string) => {
       return Array.isArray(props.activeId)
-        ? props.activeId.indexOf(id) !== -1
+        ? props.activeId.includes(id)
         : props.activeId === id;
     };
 
diff --git a/src/utils/format/unit.ts b/src/utils/format/unit.ts
index 5b0aaede8..3444a527b 100644
--- a/src/utils/format/unit.ts
+++ b/src/utils/format/unit.ts
@@ -66,13 +66,13 @@ export function unitToPx(value: string | number): number {
   }
 
   if (inBrowser) {
-    if (value.indexOf('rem') !== -1) {
+    if (value.includes('rem')) {
       return convertRem(value);
     }
-    if (value.indexOf('vw') !== -1) {
+    if (value.includes('vw')) {
       return convertVw(value);
     }
-    if (value.indexOf('vh') !== -1) {
+    if (value.includes('vh')) {
       return convertVh(value);
     }
   }