Cannot read property 'canvasId' of undefined; at wx.canvasToTempFilePath TypeError: Cannot read property 'canvasId' of undefined     at An (WAService.js:1:428255)     at Object.Mn [as canvasToTempFilePath] (WAService.js:1:428896)     at Object.<anonymous> (WAService.js:1:271002)     at Object.<anonymous> (WAService.js:1:851323)     at Function.<anonymous> (WAService.js:1:851453)     at Object.<anonymous> (WAService.js:1:256943)     at ye.canvasToTempImage (http://127.0.0.1:60152/appservice/pages/mymain/mymain.js:226:6)     at Function.(http://127.0.0.1:60152/appservice/pages/mymain/mymain.js:221:11)     at WAService.js:1:101748     at WAService.js:1:89930 <canvas canvas-id="canvas" class="hbcanvas" hidden="true"></canvas> <canvas canvas-id="mycanvas" class="hbcanvas" hidden="true"></canvas>