fix: #2030

src/pages/buy/components/BuyPopup.vue

 <template>
-<div>
   <van-popup v-model="popupVisiable" position="bottom" class="buy-popup" :style="{ height: '60%' }" >
     <div class="goods-card van-hairline--bottom">
       <div class="thumb">
@@ -29,14 +28,13 @@
         <van-button type="primary" round block color="#C01540" size="small">下一步</van-button>
       </div>
     </van-form>
-  </van-popup>
-  <van-dialog v-model="dialogVisiable" title="请选择支付方式" show-cancel-button @confirm="handleDialogConfirm">
+    <van-dialog v-model="dialogVisiable" title="请选择支付方式" show-cancel-button getContainer="body" @confirm="handleDialogConfirm">
       <van-radio-group v-model="payType">
         <van-radio name="12">支付宝支付</van-radio>
         <van-radio name="4">微信支付</van-radio>
       </van-radio-group>
     </van-dialog>
-</div>
+  </van-popup>
 </template>
 <script>
 import TagSelection from '@/components/TagSelection.vue'