chore: prettier all demos

src/index-bar/demo/index.vue

@@ -3,10 +3,7 @@
     <van-tabs v-model="activeTab" :color="BLUE">
       <van-tab :title="$t('basicUsage')">
         <van-index-bar>
-          <div
-            v-for="index in indexList"
-            :key="index"
-          >
+          <div v-for="index in indexList" :key="index">
             <van-index-anchor :index="index" />
             <van-cell :title="$t('text')" />
             <van-cell :title="$t('text')" />
@@ -17,10 +14,7 @@
 
       <van-tab :title="$t('customIndexList')">
         <van-index-bar :index-list="customIndexList">
-          <div
-            v-for="index in customIndexList"
-            :key="index"
-          >
+          <div v-for="index in customIndexList" :key="index">
             <van-index-anchor :index="index">
               {{ $t('title') + index }}
             </van-index-anchor>