diff --git a/src/collapse-item/index.js b/src/collapse-item/index.js
index 25826cde8..f84910079 100644
--- a/src/collapse-item/index.js
+++ b/src/collapse-item/index.js
@@ -1,5 +1,5 @@
 // Utils
-import { createNamespace, isDef } from '../utils';
+import { createNamespace } from '../utils';
 import { raf, doubleRaf } from '../utils/dom/raf';
 
 // Mixins
@@ -35,7 +35,7 @@ export default createComponent({
 
   computed: {
     currentName() {
-      return isDef(this.name) ? this.name : this.index;
+      return this.name ?? this.index;
     },
 
     expanded() {
diff --git a/src/goods-action-icon/index.js b/src/goods-action-icon/index.js
index b9bb118dc..dff2a5ff6 100644
--- a/src/goods-action-icon/index.js
+++ b/src/goods-action-icon/index.js
@@ -1,4 +1,4 @@
-import { createNamespace, isDef } from '../utils';
+import { createNamespace } from '../utils';
 import { route, routeProps } from '../utils/router';
 import { ChildrenMixin } from '../mixins/relation';
 import Info from '../info';
@@ -28,7 +28,7 @@ export default createComponent({
 
     genIcon() {
       const slot = this.slots('icon');
-      const info = isDef(this.badge) ? this.badge : this.info;
+      const info = this.badge ?? this.info;
 
       if (slot) {
         return (
diff --git a/src/grid-item/index.js b/src/grid-item/index.js
index ca44c7da7..3ced482e4 100644
--- a/src/grid-item/index.js
+++ b/src/grid-item/index.js
@@ -1,5 +1,5 @@
 // Utils
-import { createNamespace, addUnit, isDef } from '../utils';
+import { createNamespace, addUnit } from '../utils';
 import { BORDER } from '../utils/constant';
 import { route, routeProps } from '../utils/router';
 
@@ -71,7 +71,7 @@ export default createComponent({
 
     genIcon() {
       const iconSlot = this.slots('icon');
-      const info = isDef(this.badge) ? this.badge : this.info;
+      const info = this.badge ?? this.info;
 
       if (iconSlot) {
         return (
diff --git a/src/icon/index.tsx b/src/icon/index.tsx
index 7c087e6f4..d9962dfa1 100644
--- a/src/icon/index.tsx
+++ b/src/icon/index.tsx
@@ -1,5 +1,5 @@
 // Utils
-import { createNamespace, addUnit, isDef } from '../utils';
+import { createNamespace, addUnit } from '../utils';
 import { inherit } from '../utils/functional';
 
 // Components
@@ -64,10 +64,7 @@ function Icon(
     >
       {slots.default && slots.default()}
       {imageIcon && <img class={bem('image')} src={name} />}
-      <Info
-        dot={props.dot}
-        info={isDef(props.badge) ? props.badge : props.info}
-      />
+      <Info dot={props.dot} info={props.badge ?? props.info} />
     </props.tag>
   );
 }
diff --git a/src/picker/index.js b/src/picker/index.js
index 004b8599a..96cbf07ba 100644
--- a/src/picker/index.js
+++ b/src/picker/index.js
@@ -1,5 +1,5 @@
 // Utils
-import { createNamespace, isDef } from '../utils';
+import { createNamespace } from '../utils';
 import { preventDefault } from '../utils/dom/event';
 import { BORDER_UNSET_TOP_BOTTOM } from '../utils/constant';
 import { pickerProps, DEFAULT_ITEM_HEIGHT } from './shared';
@@ -86,9 +86,7 @@ export default createComponent({
       let cursor = { children: this.columns };
 
       while (cursor && cursor.children) {
-        const defaultIndex = isDef(cursor.defaultIndex)
-          ? cursor.defaultIndex
-          : +this.defaultIndex;
+        const defaultIndex = cursor.defaultIndex ?? +this.defaultIndex;
 
         formatted.push({
           values: cursor.children,
@@ -328,9 +326,7 @@ export default createComponent({
           allowHtml={this.allowHtml}
           className={item.className}
           itemHeight={this.itemPxHeight}
-          defaultIndex={
-            isDef(item.defaultIndex) ? item.defaultIndex : +this.defaultIndex
-          }
+          defaultIndex={item.defaultIndex ?? +this.defaultIndex}
           swipeDuration={this.swipeDuration}
           visibleItemCount={this.visibleItemCount}
           initialOptions={item.values}
diff --git a/src/progress/index.js b/src/progress/index.js
index f12ca19a9..9d90b94ba 100644
--- a/src/progress/index.js
+++ b/src/progress/index.js
@@ -1,4 +1,4 @@
-import { createNamespace, isDef, addUnit } from '../utils';
+import { createNamespace, addUnit } from '../utils';
 
 const [createComponent, bem] = createNamespace('progress');
 
@@ -49,7 +49,7 @@ export default createComponent({
 
   render() {
     const { pivotText, percentage } = this;
-    const text = isDef(pivotText) ? pivotText : percentage + '%';
+    const text = pivotText ?? percentage + '%';
     const showPivot = this.showPivot && text;
     const background = this.inactive ? '#cacaca' : this.color;
 
diff --git a/src/share-sheet/index.js b/src/share-sheet/index.js
index 744ca0ae7..39335f436 100644
--- a/src/share-sheet/index.js
+++ b/src/share-sheet/index.js
@@ -1,5 +1,5 @@
 // Utils
-import { createNamespace, isDef } from '../utils';
+import { createNamespace } from '../utils';
 
 // Mixins
 import { popupMixinProps } from '../mixins/popup';
@@ -112,7 +112,7 @@ export default createComponent({
     },
 
     genCancelText() {
-      const cancelText = isDef(this.cancelText) ? this.cancelText : t('cancel');
+      const cancelText = this.cancelText ?? t('cancel');
 
       if (cancelText) {
         return (
diff --git a/src/sidebar-item/index.js b/src/sidebar-item/index.js
index 41a64767b..54d587f1d 100644
--- a/src/sidebar-item/index.js
+++ b/src/sidebar-item/index.js
@@ -1,4 +1,4 @@
-import { createNamespace, isDef } from '../utils';
+import { createNamespace } from '../utils';
 import { ChildrenMixin } from '../mixins/relation';
 import { route, routeProps } from '../utils/router';
 import Info from '../info';
@@ -46,7 +46,7 @@ export default createComponent({
           {this.title}
           <Info
             dot={this.dot}
-            info={isDef(this.badge) ? this.badge : this.info}
+            info={this.badge ?? this.info}
             class={bem('info')}
           />
         </div>
diff --git a/src/sku/Sku.js b/src/sku/Sku.js
index 230c26191..919ab40b1 100644
--- a/src/sku/Sku.js
+++ b/src/sku/Sku.js
@@ -10,7 +10,7 @@ import SkuRowPropItem from './components/SkuRowPropItem';
 import SkuStepper from './components/SkuStepper';
 import SkuMessages from './components/SkuMessages';
 import SkuActions from './components/SkuActions';
-import { createNamespace, isDef } from '../utils';
+import { createNamespace } from '../utils';
 import {
   isAllSelected,
   isSkuChoosable,
@@ -361,7 +361,7 @@ export default createComponent({
     resetStepper() {
       const { skuStepper } = this.$refs;
       const { selectedNum } = this.initialSku;
-      const num = isDef(selectedNum) ? selectedNum : this.startSaleNum;
+      const num = selectedNum ?? this.startSaleNum;
       // 用来缓存不合法的情况
       this.stepperError = null;
 
diff --git a/src/stepper/index.js b/src/stepper/index.js
index ecf0b0942..b31a85177 100644
--- a/src/stepper/index.js
+++ b/src/stepper/index.js
@@ -72,7 +72,7 @@ export default createComponent({
   },
 
   data() {
-    const defaultValue = isDef(this.value) ? this.value : this.defaultValue;
+    const defaultValue = this.value ?? this.defaultValue;
     const value = this.format(defaultValue);
 
     if (!equal(value, this.value)) {
diff --git a/src/tab/index.js b/src/tab/index.js
index 75489232e..892f798c2 100644
--- a/src/tab/index.js
+++ b/src/tab/index.js
@@ -1,4 +1,4 @@
-import { isDef, createNamespace } from '../utils';
+import { createNamespace } from '../utils';
 import { ChildrenMixin } from '../mixins/relation';
 import { routeProps } from '../utils/router';
 
@@ -26,7 +26,7 @@ export default createComponent({
 
   computed: {
     computedName() {
-      return isDef(this.name) ? this.name : this.index;
+      return this.name ?? this.index;
     },
 
     isActive() {
diff --git a/src/tabbar-item/index.js b/src/tabbar-item/index.js
index 80b273532..309663f44 100644
--- a/src/tabbar-item/index.js
+++ b/src/tabbar-item/index.js
@@ -71,10 +71,7 @@ export default createComponent({
       <div class={bem({ active })} style={{ color }} onClick={this.onClick}>
         <div class={bem('icon')}>
           {this.genIcon(active)}
-          <Info
-            dot={this.dot}
-            info={isDef(this.badge) ? this.badge : this.info}
-          />
+          <Info dot={this.dot} info={this.badge ?? this.info} />
         </div>
         <div class={bem('text')}>{this.slots('default', { active })}</div>
       </div>
diff --git a/src/tabs/index.js b/src/tabs/index.js
index ddafe2556..86ea14c26 100644
--- a/src/tabs/index.js
+++ b/src/tabs/index.js
@@ -359,7 +359,7 @@ export default createComponent({
         refInFor
         type={type}
         dot={item.dot}
-        info={isDef(item.badge) ? item.badge : item.info}
+        info={item.badge ?? item.info}
         title={item.title}
         color={this.color}
         style={item.titleStyle}
diff --git a/src/tree-select/index.tsx b/src/tree-select/index.tsx
index 0ca699f6d..6c1685a67 100644
--- a/src/tree-select/index.tsx
+++ b/src/tree-select/index.tsx
@@ -1,5 +1,5 @@
 // Utils
-import { createNamespace, addUnit, isDef } from '../utils';
+import { createNamespace, addUnit } from '../utils';
 import { emit, inherit } from '../utils/functional';
 
 // Components
@@ -65,7 +65,7 @@ function TreeSelect(
   const Navs = items.map((item) => (
     <SidebarItem
       dot={item.dot}
-      info={isDef(item.badge) ? item.badge : item.info}
+      info={item.badge ?? item.info}
       title={item.text}
       disabled={item.disabled}
       class={[bem('nav-item'), item.className]}
diff --git a/src/utils/index.ts b/src/utils/index.ts
index 6386cc111..3e6e9e187 100644
--- a/src/utils/index.ts
+++ b/src/utils/index.ts
@@ -30,7 +30,7 @@ export function get(object: any, path: string): any {
   let result = object;
 
   keys.forEach((key) => {
-    result = isDef(result[key]) ? result[key] : '';
+    result = result[key] ?? '';
   });
 
   return result;