diff --git a/packages/components/action-sheet/_example/action-sheet.wxml b/packages/components/action-sheet/_example/action-sheet.wxml
index 974c13662..3b7df8e06 100644
--- a/packages/components/action-sheet/_example/action-sheet.wxml
+++ b/packages/components/action-sheet/_example/action-sheet.wxml
@@ -1,4 +1,4 @@
-<t-navbar class="demo-navbar" title="ActionSheet" leftArrow />
+<t-navbar class="demo-navbar" title="ActionSheet" leftArrow placeholder />
 <view class="demo">
   <t-demo-header
     title="ActionSheet 动作面板"
diff --git a/packages/components/back-top/_example/back-top.wxml b/packages/components/back-top/_example/back-top.wxml
index f91f9273e..fb6f44a45 100644
--- a/packages/components/back-top/_example/back-top.wxml
+++ b/packages/components/back-top/_example/back-top.wxml
@@ -1,4 +1,4 @@
-<t-navbar class="demo-navbar" title="BackTop" leftArrow />
+<t-navbar class="demo-navbar" title="BackTop" leftArrow placeholder />
 <view class="demo">
   <t-demo-header
     title="BackTop 返回顶部"
diff --git a/packages/components/button/_example/button.wxml b/packages/components/button/_example/button.wxml
index 49d9e90e8..e21a14487 100644
--- a/packages/components/button/_example/button.wxml
+++ b/packages/components/button/_example/button.wxml
@@ -1,4 +1,4 @@
-<t-navbar class="demo-navbar" title="Button" leftArrow />
+<t-navbar class="demo-navbar" title="Button" leftArrow placeholder />
 <view class="demo">
   <t-demo-header
     title="Button 按钮"
diff --git a/packages/components/calendar/_example/calendar.wxml b/packages/components/calendar/_example/calendar.wxml
index 196cfa7a5..15784e73f 100644
--- a/packages/components/calendar/_example/calendar.wxml
+++ b/packages/components/calendar/_example/calendar.wxml
@@ -1,4 +1,4 @@
-<t-navbar title="Calendar" leftArrow />
+<t-navbar title="Calendar" leftArrow placeholder />
 <view class="demo">
   <t-demo-header title="Calendar 日历" desc="按照日历形式展示数据或日期的容器" notice="渲染框架支持情况：WebView" />
   <t-demo title="01 组件类型" desc="基础日历">
diff --git a/packages/components/cascader/_example/cascader.wxml b/packages/components/cascader/_example/cascader.wxml
index 452dbd2fb..c344b2309 100644
--- a/packages/components/cascader/_example/cascader.wxml
+++ b/packages/components/cascader/_example/cascader.wxml
@@ -1,4 +1,4 @@
-<t-navbar title="Cascader" leftArrow />
+<t-navbar title="Cascader" leftArrow placeholder />
 <view class="demo">
   <t-demo-header title="Cascader 级联选择器" desc="用于多层级数据的逐级选择。" notice="渲染框架支持情况：WebView" />
   <t-demo title="01 类型" desc="">
diff --git a/packages/components/checkbox/_example/checkbox.wxml b/packages/components/checkbox/_example/checkbox.wxml
index def92a884..d36abf724 100644
--- a/packages/components/checkbox/_example/checkbox.wxml
+++ b/packages/components/checkbox/_example/checkbox.wxml
@@ -1,5 +1,5 @@
 <view class="skyline">
-  <t-navbar title="Checkbox" leftArrow />
+  <t-navbar title="Checkbox" leftArrow placeholder />
   <scroll-view scroll-y type="list" class="scroll-view">
     <view class="demo">
       <t-demo-header
diff --git a/packages/components/col/_example/col.wxml b/packages/components/col/_example/col.wxml
index 2483f37d7..411e4df98 100644
--- a/packages/components/col/_example/col.wxml
+++ b/packages/components/col/_example/col.wxml
@@ -1,4 +1,4 @@
-<t-navbar title="Layout" leftArrow />
+<t-navbar title="Layout" leftArrow placeholder />
 <view class="demo">
   <t-demo-header
     title="Layout 布局"
diff --git a/packages/components/collapse/_example/collapse.wxml b/packages/components/collapse/_example/collapse.wxml
index 92816789d..06c9308e1 100644
--- a/packages/components/collapse/_example/collapse.wxml
+++ b/packages/components/collapse/_example/collapse.wxml
@@ -1,4 +1,4 @@
-<t-navbar title="Collapse" leftArrow />
+<t-navbar title="Collapse" leftArrow placeholder />
 <view class="demo">
   <t-demo-header title="Collapse 折叠面板" desc="可以折叠/展开的内容区域。" notice="渲染框架支持情况：WebView" />
   <t-demo title="01 组件类型" desc="基础折叠面板">
diff --git a/packages/components/color-picker/_example/color-picker.wxml b/packages/components/color-picker/_example/color-picker.wxml
index a0f3cb0a5..e6a41dcaf 100644
--- a/packages/components/color-picker/_example/color-picker.wxml
+++ b/packages/components/color-picker/_example/color-picker.wxml
@@ -1,4 +1,4 @@
-<t-navbar class="demo-navbar" title="ColorPicker" leftArrow />
+<t-navbar class="demo-navbar" title="ColorPicker" leftArrow placeholder />
 
 <view class="demo">
   <t-demo-header
diff --git a/packages/components/count-down/_example/count-down.wxml b/packages/components/count-down/_example/count-down.wxml
index 124ea46a3..b86cea461 100644
--- a/packages/components/count-down/_example/count-down.wxml
+++ b/packages/components/count-down/_example/count-down.wxml
@@ -1,4 +1,4 @@
-<t-navbar class="demo-navbar" title="CountDown" leftArrow />
+<t-navbar class="demo-navbar" title="CountDown" leftArrow placeholder />
 <t-demo-header title="CountDown 倒计时" desc="用于实时展示倒计时数值。" notice="渲染框架支持情况：Skyline、WebView" />
 <t-demo padding title="01 组件类型">
   <base />
diff --git a/packages/components/date-time-picker/_example/date-time-picker.wxml b/packages/components/date-time-picker/_example/date-time-picker.wxml
index 425ae8b54..7acc5971c 100644
--- a/packages/components/date-time-picker/_example/date-time-picker.wxml
+++ b/packages/components/date-time-picker/_example/date-time-picker.wxml
@@ -1,4 +1,4 @@
-<t-navbar title="DateTimePicker" leftArrow />
+<t-navbar title="DateTimePicker" leftArrow placeholder />
 <view class="demo">
   <t-demo-header
     title="DateTimePicker 时间选择器"
diff --git a/packages/components/dialog/_example/dialog.wxml b/packages/components/dialog/_example/dialog.wxml
index a665f76e7..dac8296d0 100644
--- a/packages/components/dialog/_example/dialog.wxml
+++ b/packages/components/dialog/_example/dialog.wxml
@@ -1,4 +1,4 @@
-<t-navbar class="demo-navbar" title="Dialog" leftArrow />
+<t-navbar class="demo-navbar" title="Dialog" leftArrow placeholder />
 <view class="demo">
   <t-demo-header
     title="Dialog 对话框"
diff --git a/packages/components/divider/_example/divider.wxml b/packages/components/divider/_example/divider.wxml
index df77fcf22..83a372c8b 100644
--- a/packages/components/divider/_example/divider.wxml
+++ b/packages/components/divider/_example/divider.wxml
@@ -1,4 +1,4 @@
-<t-navbar class="demo-navbar" title="Divider" leftArrow />
+<t-navbar class="demo-navbar" title="Divider" leftArrow placeholder />
 <view class="demo">
   <t-demo-header
     title="Divider 分割线"
diff --git a/packages/components/drawer/_example/drawer.wxml b/packages/components/drawer/_example/drawer.wxml
index 02301221c..1fd9906d7 100644
--- a/packages/components/drawer/_example/drawer.wxml
+++ b/packages/components/drawer/_example/drawer.wxml
@@ -1,4 +1,4 @@
-<t-navbar class="demo-navbar" title="Drawer" leftArrow />
+<t-navbar class="demo-navbar" title="Drawer" leftArrow placeholder />
 <view class="demo">
   <t-demo-header
     title="Drawer 抽屉"
diff --git a/packages/components/dropdown-menu/_example/dropdown-menu.wxml b/packages/components/dropdown-menu/_example/dropdown-menu.wxml
index 6f9eb32bd..0a75f4b99 100644
--- a/packages/components/dropdown-menu/_example/dropdown-menu.wxml
+++ b/packages/components/dropdown-menu/_example/dropdown-menu.wxml
@@ -1,4 +1,4 @@
-<t-navbar title="DropdownMenu" leftArrow />
+<t-navbar title="DropdownMenu" leftArrow placeholder />
 <view class="demo">
   <t-demo-header
     title="DropdownMenu 下拉菜单"
diff --git a/packages/components/empty/_example/empty.wxml b/packages/components/empty/_example/empty.wxml
index 9f2498abd..6446a96e6 100644
--- a/packages/components/empty/_example/empty.wxml
+++ b/packages/components/empty/_example/empty.wxml
@@ -1,4 +1,4 @@
-<t-navbar class="demo-navbar" title="Empty" leftArrow />
+<t-navbar class="demo-navbar" title="Empty" leftArrow placeholder />
 <view class="demo">
   <t-demo-header title="Empty 空状态" desc="用于空状态时的占位提示。" notice="渲染框架支持情况：Skyline、WebView" />
   <t-demo title="01 类型" desc="图标空状态">
diff --git a/packages/components/fab/_example/fab.wxml b/packages/components/fab/_example/fab.wxml
index 8d6c09ab4..d26cba564 100644
--- a/packages/components/fab/_example/fab.wxml
+++ b/packages/components/fab/_example/fab.wxml
@@ -1,4 +1,4 @@
-<t-navbar class="demo-navbar" title="Fab" leftArrow />
+<t-navbar class="demo-navbar" title="Fab" leftArrow placeholder />
 <t-demo-header
   title="Fab 悬浮按钮"
   desc="当功能使用图标即可表意清楚时，可使用纯图标悬浮按钮，例如：添加、发布。"
diff --git a/packages/components/footer/_example/footer.wxml b/packages/components/footer/_example/footer.wxml
index a074d0242..c4a6bb81c 100644
--- a/packages/components/footer/_example/footer.wxml
+++ b/packages/components/footer/_example/footer.wxml
@@ -1,4 +1,4 @@
-<t-navbar class="demo-navbar" title="Footer" leftArrow />
+<t-navbar class="demo-navbar" title="Footer" leftArrow placeholder />
 <t-demo-header
   title="Footer 页脚"
   desc="用于展示网站的版权声明、联系信息、重要页面链接和其他相关内容等信息。"
diff --git a/packages/components/guide/_example/guide.wxml b/packages/components/guide/_example/guide.wxml
index 0861e9fa5..475edbd53 100644
--- a/packages/components/guide/_example/guide.wxml
+++ b/packages/components/guide/_example/guide.wxml
@@ -1,5 +1,5 @@
 <view class="custom-navbar">
-  <t-navbar class="demo-navbar" title="Guide" leftArrow />
+  <t-navbar class="demo-navbar" title="Guide" leftArrow placeholder />
 </view>
 
 <view class="demo">
diff --git a/packages/components/icon/_example/icon.wxml b/packages/components/icon/_example/icon.wxml
index d14c2b40e..c0e108ddb 100644
--- a/packages/components/icon/_example/icon.wxml
+++ b/packages/components/icon/_example/icon.wxml
@@ -1,4 +1,4 @@
-<t-navbar class="demo-navbar" title="Icon" leftArrow />
+<t-navbar class="demo-navbar" title="Icon" leftArrow placeholder />
 <view class="demo">
   <t-demo-header
     title="Icon 图标"
diff --git a/packages/components/image-viewer/_example/image-viewer.wxml b/packages/components/image-viewer/_example/image-viewer.wxml
index b8f1da4dd..a2d3fdca4 100644
--- a/packages/components/image-viewer/_example/image-viewer.wxml
+++ b/packages/components/image-viewer/_example/image-viewer.wxml
@@ -1,4 +1,4 @@
-<t-navbar class="demo-navbar" title="ImageViewer" leftArrow />
+<t-navbar class="demo-navbar" title="ImageViewer" leftArrow placeholder />
 <view class="demo">
   <t-demo-header
     title="ImageViewer 图片预览"
diff --git a/packages/components/image/_example/image.wxml b/packages/components/image/_example/image.wxml
index c50548a47..d61dc8f6e 100644
--- a/packages/components/image/_example/image.wxml
+++ b/packages/components/image/_example/image.wxml
@@ -1,4 +1,4 @@
-<t-navbar class="demo-navbar" title="Image" leftArrow />
+<t-navbar class="demo-navbar" title="Image" leftArrow placeholder />
 <view class="demo">
   <t-demo-header
     title="Image 图片"
diff --git a/packages/components/indexes/_example/indexes.wxml b/packages/components/indexes/_example/indexes.wxml
index 4e8e52da8..7215149df 100644
--- a/packages/components/indexes/_example/indexes.wxml
+++ b/packages/components/indexes/_example/indexes.wxml
@@ -1,4 +1,4 @@
-<t-navbar class="demo-navbar" title="Indexes" leftArrow />
+<t-navbar class="demo-navbar" title="Indexes" leftArrow placeholder />
 <view class="indexes">
   <t-demo-header
     title="Indexes 索引"
diff --git a/packages/components/link/_example/link.wxml b/packages/components/link/_example/link.wxml
index 220258a93..19c5c5332 100644
--- a/packages/components/link/_example/link.wxml
+++ b/packages/components/link/_example/link.wxml
@@ -1,5 +1,5 @@
 <view class="skyline">
-  <t-navbar title="Link" left-arrow capsule="{{false}}" />
+  <t-navbar title="Link" left-arrow capsule="{{false}}" placeholder />
   <scroll-view scroll-y type="list" class="scroll-view">
     <view class="demo">
       <t-demo-header
diff --git a/packages/components/message/_example/message.wxml b/packages/components/message/_example/message.wxml
index e4ae3962d..9cb78b6ed 100644
--- a/packages/components/message/_example/message.wxml
+++ b/packages/components/message/_example/message.wxml
@@ -1,4 +1,4 @@
-<t-navbar title="Message" leftArrow />
+<t-navbar title="Message" leftArrow placeholder />
 <view class="demo message-example">
   <t-demo-header
     title="Message 消息通知"
diff --git a/packages/components/notice-bar/_example/notice-bar.wxml b/packages/components/notice-bar/_example/notice-bar.wxml
index 4dc5c2c69..1676e1664 100644
--- a/packages/components/notice-bar/_example/notice-bar.wxml
+++ b/packages/components/notice-bar/_example/notice-bar.wxml
@@ -1,4 +1,4 @@
-<t-navbar class="demo-navbar" title="NoticeBar" leftArrow />
+<t-navbar class="demo-navbar" title="NoticeBar" leftArrow placeholder />
 <view class="demo">
   <t-demo-header
     title="NoticeBar 公告栏"
diff --git a/packages/components/overlay/_example/overlay.wxml b/packages/components/overlay/_example/overlay.wxml
index 9441c5a49..b3f17daec 100644
--- a/packages/components/overlay/_example/overlay.wxml
+++ b/packages/components/overlay/_example/overlay.wxml
@@ -1,4 +1,4 @@
-<t-navbar class="demo-navbar" title="Overlay" leftArrow />
+<t-navbar class="demo-navbar" title="Overlay" leftArrow placeholder />
 <view class="demo">
   <t-demo-header
     title="Overlay 遮罩层"
diff --git a/packages/components/picker/_example/picker.wxml b/packages/components/picker/_example/picker.wxml
index 114279ecf..a9c839f27 100644
--- a/packages/components/picker/_example/picker.wxml
+++ b/packages/components/picker/_example/picker.wxml
@@ -1,4 +1,4 @@
-<t-navbar title="Picker" leftArrow />
+<t-navbar title="Picker" leftArrow placeholder />
 <view class="area-picker-demo">
   <t-demo-header title="Picker 选择器" desc="用于一组预设数据中的选择。" notice="渲染框架支持情况：WebView" />
   <t-demo title="01 组件类型" desc="基础选择器">
diff --git a/packages/components/popover/_example/popover.wxml b/packages/components/popover/_example/popover.wxml
index 8b8aa9234..d129d90fe 100644
--- a/packages/components/popover/_example/popover.wxml
+++ b/packages/components/popover/_example/popover.wxml
@@ -1,4 +1,4 @@
-<t-navbar class="demo-navbar" title="Popover" leftArrow />
+<t-navbar class="demo-navbar" title="Popover" leftArrow placeholder />
 <t-demo-header title="Popover 弹出气泡" desc="用于文字提示的气泡框。" notice="渲染框架支持情况：WebView" />
 <view class="tdesign-demo-popover">
   <t-demo title="01 组件类型" padding>
diff --git a/packages/components/popup/_example/popup.wxml b/packages/components/popup/_example/popup.wxml
index a73001b6f..0f55cd59c 100644
--- a/packages/components/popup/_example/popup.wxml
+++ b/packages/components/popup/_example/popup.wxml
@@ -1,4 +1,4 @@
-<t-navbar class="demo-navbar" title="Popup" leftArrow />
+<t-navbar class="demo-navbar" title="Popup" leftArrow placeholder />
 <t-demo-header
   title="Popup 弹出层"
   desc="由其他控件触发，屏幕滑出或弹出一块自定义内容区域。"
diff --git a/packages/components/progress/_example/progress.wxml b/packages/components/progress/_example/progress.wxml
index dd07826f2..edb35e4dc 100644
--- a/packages/components/progress/_example/progress.wxml
+++ b/packages/components/progress/_example/progress.wxml
@@ -1,5 +1,5 @@
 <view class="skyline">
-  <t-navbar class="demo-navbar" title="Progress" leftArrow />
+  <t-navbar class="demo-navbar" title="Progress" leftArrow placeholder />
   <scroll-view scroll-y type="list" class="scroll-view">
     <view class="demo">
       <t-demo-header
diff --git a/packages/components/radio/_example/radio.wxml b/packages/components/radio/_example/radio.wxml
index 2a8e5c3f8..8f069f4b4 100644
--- a/packages/components/radio/_example/radio.wxml
+++ b/packages/components/radio/_example/radio.wxml
@@ -1,5 +1,5 @@
 <view class="skyline">
-  <t-navbar title="Radio" leftArrow />
+  <t-navbar title="Radio" leftArrow placeholder />
   <scroll-view scroll-y type="list" class="scroll-view">
     <view class="demo" hover-class="none" hover-stop-propagation="false">
       <t-demo-header
diff --git a/packages/components/rate/_example/rate.wxml b/packages/components/rate/_example/rate.wxml
index 0f96aaa1c..9070cd6e6 100644
--- a/packages/components/rate/_example/rate.wxml
+++ b/packages/components/rate/_example/rate.wxml
@@ -1,4 +1,4 @@
-<t-navbar title="Rate" leftArrow />
+<t-navbar title="Rate" leftArrow placeholder />
 <view class="demo">
   <t-demo-header title="Rate 评分" desc="用于对某行为/事物进行打分。" notice="渲染框架支持情况：WebView" />
   <t-demo title="01 组件类型">
diff --git a/packages/components/result/_example/result.wxml b/packages/components/result/_example/result.wxml
index 0300bbcde..5843fded7 100644
--- a/packages/components/result/_example/result.wxml
+++ b/packages/components/result/_example/result.wxml
@@ -1,4 +1,4 @@
-<t-navbar class="demo-navbar" title="Result" leftArrow />
+<t-navbar class="demo-navbar" title="Result" leftArrow placeholder />
 <view class="demo">
   <t-demo-header title="Result 结果" desc="用于反馈不同结果的展示。" notice="渲染框架支持情况：Skyline、WebView" />
   <t-demo title="组件类型" desc="基础结果">
diff --git a/packages/components/side-bar/_example/side-bar.wxml b/packages/components/side-bar/_example/side-bar.wxml
index f1e00d962..104c059b1 100644
--- a/packages/components/side-bar/_example/side-bar.wxml
+++ b/packages/components/side-bar/_example/side-bar.wxml
@@ -1,4 +1,4 @@
-<t-navbar class="demo-navbar" title="SideBar" leftArrow />
+<t-navbar class="demo-navbar" title="SideBar" leftArrow placeholder />
 
 <t-demo-header
   title="SideBar 侧边栏"
diff --git a/packages/components/skeleton/_example/skeleton.wxml b/packages/components/skeleton/_example/skeleton.wxml
index 13e4727ac..f01442b54 100644
--- a/packages/components/skeleton/_example/skeleton.wxml
+++ b/packages/components/skeleton/_example/skeleton.wxml
@@ -1,4 +1,4 @@
-<t-navbar class="demo-navbar" title="Skeleton" leftArrow />
+<t-navbar class="demo-navbar" title="Skeleton" leftArrow placeholder />
 <view class="demo">
   <t-demo-header
     title="Skeleton 骨架屏"
diff --git a/packages/components/stepper/_example/stepper.wxml b/packages/components/stepper/_example/stepper.wxml
index ceb827535..03eb75ce8 100644
--- a/packages/components/stepper/_example/stepper.wxml
+++ b/packages/components/stepper/_example/stepper.wxml
@@ -1,4 +1,4 @@
-<t-navbar title="Stepper" leftArrow />
+<t-navbar title="Stepper" leftArrow placeholder />
 <view class="demo">
   <t-demo-header title="Stepper 步进器" desc="用于数量的增减。" notice="渲染框架支持情况：Skyline、WebView" />
   <t-demo title="01 组件类型" desc="基础步进器">
diff --git a/packages/components/swipe-cell/_example/swipe-cell.wxml b/packages/components/swipe-cell/_example/swipe-cell.wxml
index a24475cf1..2433ca14b 100644
--- a/packages/components/swipe-cell/_example/swipe-cell.wxml
+++ b/packages/components/swipe-cell/_example/swipe-cell.wxml
@@ -1,4 +1,4 @@
-<t-navbar title="SwipeCell" leftArrow />
+<t-navbar title="SwipeCell" leftArrow placeholder />
 <view class="demo">
   <t-demo-header
     title="SwipeCell 滑动操作"
diff --git a/packages/components/switch/_example/switch.wxml b/packages/components/switch/_example/switch.wxml
index 49e370480..808373f2d 100644
--- a/packages/components/switch/_example/switch.wxml
+++ b/packages/components/switch/_example/switch.wxml
@@ -1,4 +1,4 @@
-<t-navbar title="Switch" leftArrow />
+<t-navbar title="Switch" leftArrow placeholder />
 <view class="demo">
   <t-demo-header
     title="Switch 开关"
diff --git a/packages/components/tag/_example/tag.wxml b/packages/components/tag/_example/tag.wxml
index efa2d3dcb..f9d8b2217 100644
--- a/packages/components/tag/_example/tag.wxml
+++ b/packages/components/tag/_example/tag.wxml
@@ -1,4 +1,4 @@
-<t-navbar class="demo-navbar" title="Tag" leftArrow />
+<t-navbar class="demo-navbar" title="Tag" leftArrow placeholder />
 <view class="demo">
   <t-demo-header title="Tag 标签" desc="用于表明主体的类目，属性或状态。" notice="渲染框架支持情况：Skyline、WebView" />
   <t-demo title="01 组件类型">
diff --git a/packages/components/toast/_example/toast.wxml b/packages/components/toast/_example/toast.wxml
index 19557fabe..09b6abe0b 100644
--- a/packages/components/toast/_example/toast.wxml
+++ b/packages/components/toast/_example/toast.wxml
@@ -1,4 +1,4 @@
-<t-navbar class="demo-navbar" title="Toast" leftArrow />
+<t-navbar class="demo-navbar" title="Toast" leftArrow placeholder />
 <view class="demo">
   <t-demo-header
     title="Toast 轻提示"
diff --git a/packages/components/tree-select/_example/tree-select.wxml b/packages/components/tree-select/_example/tree-select.wxml
index 25faeb221..82095d66e 100644
--- a/packages/components/tree-select/_example/tree-select.wxml
+++ b/packages/components/tree-select/_example/tree-select.wxml
@@ -1,4 +1,4 @@
-<t-navbar title="TreeSelect" leftArrow />
+<t-navbar title="TreeSelect" leftArrow placeholder />
 <view class="demo">
   <t-demo-header title="TreeSelect 树形选择器" desc="用于多层级数据的逐级选择。" notice="渲染框架支持情况：WebView" />
   <t-demo title="01 组件类型" desc="基础树形选择器">
diff --git a/packages/components/upload/_example/upload.wxml b/packages/components/upload/_example/upload.wxml
index b5f64e27f..5d38e694f 100644
--- a/packages/components/upload/_example/upload.wxml
+++ b/packages/components/upload/_example/upload.wxml
@@ -1,4 +1,4 @@
-<t-navbar title="Upload" leftArrow />
+<t-navbar title="Upload" leftArrow placeholder />
 <view class="demo">
   <t-demo-header title="Upload 上传" notice="渲染框架支持情况：WebView">
     <view slot="desc">
diff --git a/packages/components/watermark/_example/watermark.wxml b/packages/components/watermark/_example/watermark.wxml
index c72118b3e..d8f88c9d5 100644
--- a/packages/components/watermark/_example/watermark.wxml
+++ b/packages/components/watermark/_example/watermark.wxml
@@ -1,4 +1,4 @@
-<t-navbar title="Watermark" leftArrow />
+<t-navbar title="Watermark" leftArrow placeholder />
 <view class="demo">
   <t-demo-header title="Watermark 水印" desc="给页面的某个区域加上水印。" notice="渲染框架支持情况：WebView" />
   <t-demo title="01 组件类型" desc="文字水印">
diff --git a/packages/pro-components/chat/attachments/_example/attachments.wxml b/packages/pro-components/chat/attachments/_example/attachments.wxml
index e3f4bbd1d..b09a7e2cb 100644
--- a/packages/pro-components/chat/attachments/_example/attachments.wxml
+++ b/packages/pro-components/chat/attachments/_example/attachments.wxml
@@ -1,4 +1,4 @@
-<t-navbar class="demo-navbar" title="Attachments" leftArrow />
+<t-navbar class="demo-navbar" title="Attachments" leftArrow placeholder />
 <view class="demo">
   <t-demo-header
     title="Attachments 文件附件"
diff --git a/packages/pro-components/chat/chat-actionbar/_example/chat-actionbar.wxml b/packages/pro-components/chat/chat-actionbar/_example/chat-actionbar.wxml
index df643c063..9bfe861e6 100644
--- a/packages/pro-components/chat/chat-actionbar/_example/chat-actionbar.wxml
+++ b/packages/pro-components/chat/chat-actionbar/_example/chat-actionbar.wxml
@@ -1,4 +1,4 @@
-<t-navbar class="demo-navbar" title="ChatActionbar" leftArrow />
+<t-navbar class="demo-navbar" title="ChatActionbar" leftArrow placeholder />
 <view class="demo">
   <t-demo-header
     title="ChatActionbar 对话操作"
diff --git a/packages/pro-components/chat/chat-content/_example/chat-content.wxml b/packages/pro-components/chat/chat-content/_example/chat-content.wxml
index 59dbe9f6a..2d63cc958 100644
--- a/packages/pro-components/chat/chat-content/_example/chat-content.wxml
+++ b/packages/pro-components/chat/chat-content/_example/chat-content.wxml
@@ -1,4 +1,4 @@
-<t-navbar class="demo-navbar" title="ChatContent" leftArrow />
+<t-navbar class="demo-navbar" title="ChatContent" leftArrow placeholder />
 <view class="demo">
   <t-demo-header title="ChatContent 对话正文" desc="支持 markdown 格式的渲染。" notice="渲染框架支持情况：WebView" />
   <t-demo title="01 组件类型">
diff --git a/packages/pro-components/chat/chat-loading/_example/chat-loading.wxml b/packages/pro-components/chat/chat-loading/_example/chat-loading.wxml
index 41efd14a6..ff980db3f 100644
--- a/packages/pro-components/chat/chat-loading/_example/chat-loading.wxml
+++ b/packages/pro-components/chat/chat-loading/_example/chat-loading.wxml
@@ -1,4 +1,4 @@
-<t-navbar class="demo-navbar" title="ChatLoading" leftArrow />
+<t-navbar class="demo-navbar" title="ChatLoading" leftArrow placeholder />
 <view class="demo">
   <t-demo-header
     title="ChatLoading 对话加载"
diff --git a/packages/pro-components/chat/chat-markdown/_example/chat-markdown.wxml b/packages/pro-components/chat/chat-markdown/_example/chat-markdown.wxml
index ed1119a7e..96a5a9b94 100644
--- a/packages/pro-components/chat/chat-markdown/_example/chat-markdown.wxml
+++ b/packages/pro-components/chat/chat-markdown/_example/chat-markdown.wxml
@@ -1,4 +1,4 @@
-<t-navbar class="demo-navbar" title="ChatMarkdown" leftArrow />
+<t-navbar class="demo-navbar" title="ChatMarkdown" leftArrow placeholder />
 <view class="demo">
   <t-demo-header
     title="ChatMarkdown Markdown内容"
diff --git a/packages/pro-components/chat/chat-message/_example/chat-message.wxml b/packages/pro-components/chat/chat-message/_example/chat-message.wxml
index 722bcde5e..b42ab7051 100644
--- a/packages/pro-components/chat/chat-message/_example/chat-message.wxml
+++ b/packages/pro-components/chat/chat-message/_example/chat-message.wxml
@@ -1,4 +1,4 @@
-<t-navbar class="demo-navbar" title="ChatMessage" leftArrow />
+<t-navbar class="demo-navbar" title="ChatMessage" leftArrow placeholder />
 <view class="demo">
   <t-demo-header
     title="ChatMessage 对话消息体"
diff --git a/packages/pro-components/chat/chat-thinking/_example/chat-thinking.wxml b/packages/pro-components/chat/chat-thinking/_example/chat-thinking.wxml
index 689d8e233..56c058365 100644
--- a/packages/pro-components/chat/chat-thinking/_example/chat-thinking.wxml
+++ b/packages/pro-components/chat/chat-thinking/_example/chat-thinking.wxml
@@ -1,4 +1,4 @@
-<t-navbar class="demo-navbar" title="ChatThinking" leftArrow />
+<t-navbar class="demo-navbar" title="ChatThinking" leftArrow placeholder />
 
 <view class="demo">
   <t-demo-header title="ChatThinking 思考过程" desc="用于展示思考过程的组件。" notice="渲染框架支持情况：WebView" />