showDownloadViewportModal: ({  viewports }) => {// 改变尺寸function doResize(width, height,el) {if (width < 100)width = 100if (height < 100)height = 100​el.style.width = width + 'px';el.style.height = height + 'px';cornerstone.resize(el);}const activeViewportIndex = viewports.activeViewportIndex;const activeViewport = getEnabledElement(activeViewportIndex);const enabledElement = cornerstone.getEnabledElement(activeViewport);const viewport = Object.assign({}, enabledElement.viewport);delete viewport.scale;viewport.translation = {x: 0,y: 0,};const viewportElement = document.querySelector(".cornerstone-canvas-nn");cornerstone.enable(viewportElement); // 初始化// 插入数据cornerstone.loadAndCacheImage(enabledElement.image.imageId).then(function(image) {cornerstone.displayImage(viewportElement, image); //插入图片cornerstone.setViewport(viewportElement, viewport);//设置视图，设置现在显示的状态，如旋转等cornerstone.resize(viewportElement, true);//先自适应调整一次，保证视图完整});//插入数据后，再执行尺寸的改变doResize(512,512,viewportElement) // 改变尺寸console.log(viewportElement);//延时setTimeout(function () {// alert('VIDEO HAS STOPPED');console.log("延迟执行");console.log(viewportElement.querySelector('canvas').toDataURL()); // 打印数据// console.log(document.querySelector("#root > div.FlexboxLayout > div.main-content > div > div > div > div.cornerstone-canvas-nn > canvas").toDataURL()); //绝对地址定位viewportElement.querySelector('canvas').toBlob(blob => {const URLObj = window.URL || window.webkitURL;const a = document.createElement('a');a.href = URLObj.createObjectURL(blob);a.download = 'imgs.jpg';document.body.appendChild(a);a.click();document.body.removeChild(a);});cornerstone.invalidate(viewportElement); // 删除el，一定要删除，不然连续下载，因为原始尺寸会产生插入数据不完整}, 500);},