<view class="show-container">
  <block wx:if="{{r0}}">
  <canvas type="webgl" id="webgl" style="width:100vw;height:100vh" bindtouchstart="{{a}}" bindtouchmove="{{b}}" bindtouchend="{{c}}">
      <view class="control-box">我是测试文本</view>
      <view class="test-btn"><button>测试按钮</button></view>
    </canvas>
    </block>
  <view class="text">我是测试文本</view>
</view>