关于新版本canvasGetImageData报错的解决方法

蓝牙打印一直用到uni.canvasGetImageData生成画布，更新新版本后一直报错，现在使用uni.canvasPutImageData替代

               uni.canvasPutImageData({  
                  canvasId: 'prite_area_canvas',  
                  x: 0,  
                  y: 0,  
                  width: canvasWidth,  
                  height: canvasHeight,  
                  data: command.getData(),  
                  success: function(res) {  
                    console.log('success')  
                    command.setBitmap(res)  
                  },  
                  fail:function(){  
                    console.log('fail')  
                  },  
                  complete: function() {  
                    // command.setPrintAndFeedRow(3);  
                    console.log('complete')  
                    that.prepareSend(command.getData());  
                  }  
                })