aliapp-demo/page/API/canvas/canvas.axml

<view class="page">
  <view class="page-description">画布 API</view>
  <view class="page-section">
    <view class="page-section-title">my.createCanvasContext</view>
    <view class="page-section-demo">
      <canvas class="canvas-element" id="canvas" onTap="log" onTouchStart="log"></canvas>
    </view>
    <scroll-view class="canvas-buttons" scroll-y="true">
      <block a:for="{{methods}}" a:for-item="method">
        <button class="canvas-button" type="primary" onTap="{{method}}">{{method}}</button>
      </block>
    </scroll-view>
    <button class="canvas-button" type="primary" onTap="toTempFilePath">toTempFilePath</button>
  </view>
</view>