[OHIF-Viewers]医疗数字阅片-医学影像-数字胶片直接下载，不再弹窗进行设置

     showDownloadViewportModal: ({  viewports }) => {
       // 改变尺寸
       function doResize(width, height,el) {
         if (width < 100)
           width = 100
         if (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);
      },