canvas 画布

uni app ios render.js canvas 设置了img.crossOrigin = "anonymous"; 怎么不往下执行

                let self = this;  
                img.src = data;  
                // img.crossOrigin = "Anonymous"  
                img.crossOrigin = "anonymous";   
                img.onload = function(e) {  
                    var canvas = document.createElement("canvas");  
                    var ctx = canvas.getContext("2d");  
                    //在css中不要直接给img设置宽高,否则此处会获取到css设置的值  
                    var width = img.width;  
                    var height = img.height;  
                    //比较图片宽高设置图片显示和canvas画布尺寸  
                    if (width > height) {  
                        if (width >= 1080) {  
                            height = Math.round(height *= 1080 / width);  
                            width = 1080;  
                        }  
                    } else {  
                        if (height >= 1440) {  
                            width = Math.round(width *= 1440 / height);  
                            height = 1440;  
                        }  
                    }  
                    canvas.width = width; //设置新的图片的宽度  
                    canvas.height = height; //设置新的图片的长度  
                    ctx.drawImage(img, 0, 0, width, height); //绘图  
                    try {  
                        // var dataURL = canvas.toDataURL("image/jpeg", 0.8);  
                        canvas.toBlob((blob) => {  
                            // 调用回调函数，传入压缩后的图片数据    
                            console.log(blob, '----blob')  
                        }, 'image/jpeg', 0.8);  
                        // console.log(dataURL,'--dataURL')  
                    } catch (error) {  
                        console.log(error, '-----error')  
                    }  
                    // var dataURL = canvas.toDataURL("image/jpeg", 0.8); //供img标签使用的src路径  
                    // self.$ownerInstance.callMethod('NewuploadFile', {  
                    //  fileUrl: dataURL,  
                    //  url: data,  
                    // })  

                }  
            },```