feat(example): add a11y support

example/components/pull-down-list/index.wxml

@@ -1,12 +1,12 @@
 <view class="pullDownList t-class {{ childBoxHeight > 0 ? 'actived' : '' }}">
-  <view class="switchBox" catch:tap="switchHandle">
+  <view class="switchBox" aria-role="button" aria-expanded="{{!!childBoxHeight}}" catch:tap="switchHandle">
     <view class="name">{{ name }}</view>
     <t-icon name="{{icon}}" size="48rpx" color="#A6A6A6" t-class="icon" />
   </view>
-  <view class="childBox" style="height: {{ childBoxHeight }}rpx">
-    <view class="child" wx:for="{{childArr}}" wx:key="name" data-item="{{item}}" bind:tap="tapChild">
+  <view class="childBox" style="height: {{ childBoxHeight }}rpx" aria-hidden="{{childBoxHeight ? '' : true}}">
+    <view class="child" wx:for="{{childArr}}" wx:key="name" data-item="{{item}}" aria-role="button" bind:tap="tapChild">
       {{ item.name }} {{ item.label }}
-      <t-icon name="chevron-right" color="#bbb" />
+      <t-icon name="chevron-right" color="#bbb" aria-hidden="{{childBoxHeight ? '' : true}}" />
     </view>
   </view>
 </view>

example/pages/home/home.wxml

@@ -1,6 +1,12 @@
 <view class="main">
   <view class="title-wrap">
-    <image class="title-icon" mode="aspectFit" src="/assets/TDesignLogo@2x.png" />
+    <image
+      class="title-icon"
+      mode="aspectFit"
+      src="/assets/TDesignLogo@2x.png"
+      alt="TDesign Logo"
+      aria-label="TDesign Logo"
+    />
   </view>
   <view class="desc"> TDesign 适配微信小程序的组件库 </view>
   <pull-down-list