aliapp-demo/page/component/component-pages/canvas/canvas.axml

<view class="page">
  <view class="canvas-view">
    <canvas 
      id="canvas"
      width="610"
      height="610"
      class="canvas"
      onTouchStart="log"
      onTouchMove="log"
      onTouchEnd="log"
    />
  </view>
</view>