diff --git a/src/tabbar/README.md b/src/tabbar/README.md
index 3c3a4fb2f..68d4970ae 100644
--- a/src/tabbar/README.md
+++ b/src/tabbar/README.md
@@ -171,9 +171,9 @@ export default {
 
 ### Tabbar Events
 
-| Event  | Description                      | Arguments                    |
-| ------ | -------------------------------- | ---------------------------- |
-| change | Emitted when changing active tab | active: index of current tab |
+| Event  | Description                      | Arguments                  |
+| ------ | -------------------------------- | -------------------------- |
+| change | Emitted when changing active tab | _active: number \| string_ |
 
 ### TabbarItem Props
 
@@ -190,9 +190,9 @@ export default {
 
 ### TabbarItem Slots
 
-| Name | Description | SlotProps |
-| ---- | ----------- | --------- |
-| icon | Custom icon | active    |
+| Name | Description | SlotProps                  |
+| ---- | ----------- | -------------------------- |
+| icon | Custom icon |  _active: boolean_ |
 
 ### Less Variables
 
diff --git a/src/tabbar/README.zh-CN.md b/src/tabbar/README.zh-CN.md
index 79efbd5da..e6a8e4a61 100644
--- a/src/tabbar/README.zh-CN.md
+++ b/src/tabbar/README.zh-CN.md
@@ -115,6 +115,8 @@ export default {
 
 ### 自定义颜色
 
+通过 `active-color` 属性设置选中标签的颜色，通过 `inactive-color` 属性设置未选中标签的颜色。
+
 ```html
 <van-tabbar v-model="active" active-color="#ee0a24" inactive-color="#000">
   <van-tabbar-item icon="home-o">标签</van-tabbar-item>
@@ -126,6 +128,8 @@ export default {
 
 ### 监听切换事件
 
+通过 `change` 事件来监听选中标签的变化。
+
 ```html
 <van-tabbar v-model="active" @change="onChange">
   <van-tabbar-item icon="home-o">标签 1</van-tabbar-item>
@@ -185,7 +189,7 @@ export default {
 
 | 事件名 | 说明           | 回调参数                           |
 | ------ | -------------- | ---------------------------------- |
-| change | 切换标签时触发 | active: 当前选中标签的名称或索引值 |
+| change | 切换标签时触发 | _active: number \| string_ |
 
 ### TabbarItem Props
 
@@ -204,7 +208,7 @@ export default {
 
 | 名称 | 说明       | 参数                   |
 | ---- | ---------- | ---------------------- |
-| icon | 自定义图标 | active: 是否为选中标签 |
+| icon | 自定义图标 | _active: boolean_ |
 
 ### 样式变量
 
diff --git a/src/tabbar/Tabbar.tsx b/src/tabbar/Tabbar.tsx
index 948f8a16a..4e38ffdd7 100644
--- a/src/tabbar/Tabbar.tsx
+++ b/src/tabbar/Tabbar.tsx
@@ -55,13 +55,8 @@ export default defineComponent({
     const { linkChildren } = useChildren(TABBAR_KEY);
     const renderPlaceholder = usePlaceholder(root, bem);
 
-    const isUnfit = () => {
-      if (props.safeAreaInsetBottom !== null) {
-        return !props.safeAreaInsetBottom;
-      }
-      // enable safe-area-inset-bottom by default when fixed
-      return !props.fixed;
-    };
+    // enable safe-area-inset-bottom by default when fixed
+    const isUnfit = () => !(props.safeAreaInsetBottom ?? props.fixed);
 
     const renderTabbar = () => {
       const { fixed, zIndex, border } = props;