Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you may not be able to execute some actions.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
wx.createCanvasContext('myCanvas',this) wx.canvasToTempFilePath({},this) 这两个this到底要不要传？怎么传？ 我试验过不传和传this 都会报errMsg: "canvasToTempFilePath: fail canvas is empty"。 求解啊！