feat(harmony): web-view 支持 bounces、onAlert

pages/component/web-view/web-view.uvue

@@ -18,15 +18,12 @@
         <button class="uni-flex-item" type="primary" @click="reload">重新加载</button>
         <button class="margin-left-5 uni-flex-item" type="primary" @click="stop">停止加载</button>
       </view>
-      <!-- #ifndef APP-HARMONY -->
-      <!-- TODO harmony 执行 alert 无反应 -->
       <view class="uni-row uni-btn-v">
         <button class="uni-flex-item" type="primary" @click="nativeToWeb">原生和Web通信</button>
         <!-- #ifdef APP-ANDROID || APP-IOS -->
         <button class="margin-left-5 uni-flex-item" type="primary" @click="getContentHeight">获取内容高度</button>
         <!-- #endif -->
       </view>
-      <!-- #endif -->
       <view class="uni-btn-v">
         <navigator url="/pages/component/web-view/web-view-scroll">
           <button type="primary">scroll-view嵌套web-view</button>