mac系统，使用uni.canvasGetImageData方法的时候会导致进程崩溃，控制台不输出

使用安卓手机并不报错！只有运行苹果手机会进程崩溃！

uni.canvasGetImageData({  
                    canvasId: 'test', //test l-painterText  
                    x: 0,  
                    y: 0,  
                    width: 576,  
                    height: 448,  
                    success: function(res) {  
                        console.log(res)  
                        const diff = Date.now() - uni.getStorageSync('time') // 时间差  
                        console.log("获取画布数据成功" + (diff / 1000) + "秒")  
                        printerRef.printBitMap(res);  
                    },  
                    complete: function(res) {  
                        console.log("finish")  
                    },  
                    fail: function(res) {  
                        console.log(res)  
                    }  
                })