描述： 对画布截图， 当图片太大分成2张截图数据， 当第2次调用canvasGetImageData时 ， 如任何反应（success，fail，complete 这个3回调都没日志输入） 。[图片] 代码如下：   //图形快照     this.Snapshot=function()     {       var self=this;       var width = this.ChartBorder.GetChartWidth();       var height = this.ChartBorder.GetChartHeight();             if (width > 400)       {           width=400;                     wx.canvasGetImageData(             {               canvasId: this.ChartBorder.UIElement.ID,               x: 0,               y: 0,               width: width,               height: height,               success(res) {                 self.ScreenImageData =                   {                     Data: res.data,                     Info: { X: 0, Y: 0, Width: width, Height: height }                   };                 console.log("[HQTradeFrame::Snapshot] canvasGetImageData finish. (large image. Page.1)");                 console.log(self.ScreenImageData.Info);               }             });                       var width2 = self.ChartBorder.GetChartWidth() - width;           var x = width;           wx.canvasGetImageData(             {               canvasId: self.ChartBorder.UIElement.ID,               x: x,               y: 0,               width: width,               height: height,               success(res) {                 self.ScreenImageData2 =                   {                     Data: res.data,                     Info: { X: x, Y: 0, Width: width2, Height: height }                   };                 console.log("[HQTradeFrame::Snapshot] canvasGetImageData finish. (large image. Page.2)");                 console.log(self.ScreenImageData2.Info);               },               fail(res) {                 console.log("[HQTradeFrame::Snapshot] canvasGetImageData finish. (large image. Page.2)");               },               complete(res){                 console.log("[HQTradeFrame::Snapshot] canvasGetImageData finish. (large image. Page.2)");               }             });       }       else       {           self.ScreenImageData2 = null;           wx.canvasGetImageData(             {               canvasId: this.ChartBorder.UIElement.ID,               x: 0,               y: 0,               width: width,               height: height,               success(res) {                 self.ScreenImageData =                   {                     Data: res.data,                     Info: { X: 0, Y: 0, Width: width, Height: height }                   };                 console.log("[HQTradeFrame::Snapshot] canvasGetImageData finish. (small image)");                 console.log(self.ScreenImageData.Info);               }             });       }     }