https://developers.weixin.qq.com/miniprogram/dev/component/canvas.htmlhttps://developers.weixin.qq.com/miniprogram/dev/api/canvas/Canvas.getContext.html

<canvas

      class="canvas"

      type="2d"

      disable-scroll="{{false}}"

      bindtouchstart="onStart"

      bindtouchmove="onMove"

      bindtouchend="onEnd" />

这是代码片段，今天突然发现不能通过手机屏幕绘制内容了，之前都是正常的，什么原因？