TSYWXT-WX-APP/pages/sign/sign.wxml

<!--pages/sign.wxml-->
<view class="sign-contain">
 <view class="signName">
  <canvas id="canvas" canvas-id="canvas" class="{{ sysType === 'iOS' ? 'canvas' : 'canvas bg000'}}" disable-scroll="true" bindtouchstart="canvasStart" bindtouchmove="canvasMove" bindtouchend="canvasEnd" touchcancel="canvasEnd" binderror="canvasIdErrorCallback"></canvas>
 </view>
 
 <view class="btn-wrap">
  <button  catchtap="cleardraw">清除签名</button>
  <button  catchtap="uploadImg">上传签名</button>
 </view>
</view>