docs(Icon): improve demo (#5215)

src/tabbar/README.md

@@ -116,10 +116,7 @@ export default {
 ### Change Event
 
 ```html
-<van-tabbar 
-  v-model="active" 
-  @change="onChange"
->
+<van-tabbar v-model="active" @change="onChange">
   <van-tabbar-item icon="home-o">Tab1</van-tabbar-item>
   <van-tabbar-item icon="search">Tab2</van-tabbar-item>
   <van-tabbar-item icon="freinds-o">Tab3</van-tabbar-item>

src/tabbar/README.zh-CN.md

@@ -118,13 +118,10 @@ export default {
 </van-tabbar>
 ```
 
-### Change 事件
+### 监听切换事件
 
 ```html
-<van-tabbar 
-  v-model="active" 
-  @change="onChange"
->
+<van-tabbar v-model="active" @change="onChange">
   <van-tabbar-item icon="home-o">标签1</van-tabbar-item>
   <van-tabbar-item icon="search">标签2</van-tabbar-item>
   <van-tabbar-item icon="freinds-o">标签3</van-tabbar-item>

src/tabbar/demo/index.vue

@@ -68,7 +68,7 @@ export default {
       customIcon: '自定义图标',
       customColor: '自定义颜色',
       matchByName: '通过名称匹配',
-      switchEvent: '切换标签事件',
+      switchEvent: '监听切换事件',
       selectTip: '你切换到了'
     },
     'en-US': {