传运单接口 trace_waybill 描述：商户使用此接口向微信提供某交易单号对应的运单号。微信后台会跟踪运单的状态变化请求方法： POST application/json请求地址：https://api.weixin.qq.com/cgi-bin/express/delivery/open_msg/trace_waybill?access_token=XXX请求参数这个图片大小一共是多少？

let sharedCanvas = wx.getSharedCanvas(); let sharedContext = sharedCanvas.getContext('2d') let canvas = wx.createCanvas(); canvas.width = sharedCanvas.width; canvas.height = sharedCanvas.height; wx.onMessage(data => {  sharedContext.drawImage(canvas, 0, 0); }); 以上代码会报错，同样会报错的还有wx.createImage返回的对象一样会报错，这个刚才看到论坛里有一样的问题，到现在仍然没解决。 如果不在wx.onMessage理调用，比如直接在代码段里调用是没问题的，只要是在wx.xxxx的回调里执行都会报错，希望尽快解决这个问题。 ------------------------------------------------------------------------------------------------------------------------------------------ gameSubContextThirdScriptError Failed to execute 'drawImage' on 'CanvasRenderingContext2D': The provided value is not of type '(CSSImageValue or HTMLImageElement or SVGImageElement or HTMLVideoElement or HTMLCanvasElement or ImageBitmap or OffscreenCanvas)';at onMessage callback function TypeError: Failed to execute 'drawImage' on 'CanvasRenderingContext2D': The provided value is not of type '(CSSImageValue or HTMLImageElement or SVGImageElement or HTMLVideoElement or HTMLCanvasElement or ImageBitmap or OffscreenCanvas)'     at CanvasRenderingContext2D.t.(anonymous function) (http://127.0.0.1:57565/game/__dev__/WAGame.js:12:17613)     at CanvasRenderingContext2D.e.(anonymous function) [as drawImage] (http://127.0.0.1:57565/game/__dev__/WAGame.js:12:18953)     at Function.<anonymous> (http://127.0.0.1:57565/game/js/open/index.js:11:17)     at f.<anonymous> (http://127.0.0.1:57565/game/__subdev__/WAGameSubContext.js:4:26185)     at f.emit (http://127.0.0.1:57565/game/__subdev__/WAGameSubContext.js:4:453)     at http://127.0.0.1:57565/game/__subdev__/WAGameSubContext.js:4:8953     at Object.p [as subscribeHandler] (http://127.0.0.1:57565/game/__subdev__/WAGameSubContext.js:3:13572)     at http://127.0.0.1:57565/game/__dev__/WAGame.js:3:16001     at Array.forEach (<anonymous>)     at Object.S [as publish] (http://127.0.0.1:57565/game/__dev__/WAGame.js:3:15965) [图片]

如题，代码样例 var a = wx.createInnerAudioContext(); a.onCanPlay(function(){     console.log(a.duration);// 这里得到的数据基本上都是0 }) a.src = 'xxxx.mp3' a.play();//播放是可以正常播放的