smallexecanvas/index/index.wxml

<canvas type="2d" id="canvas" disable-scroll bindtouchmove="move" bindtouchend="end"  bindtouchstart="start" style="width: 100vw;height: 600rpx;"></canvas>

<view class="tool">
  <block wx:for="{{list}}" wx:key="item">
    <image src="{{item.url}}" mode="aspectFit" data-item="{{item}}" bind:tap="changeTool" />
  </block>
</view>
<view>
  <button bind:tap="back">撤销</button>
  <button bind:tap="clear">清空</button>
  <button bind:tap="save">保存</button>
</view>