html2canvas 将网页截图为图片，上传base64 到服务端

await html2canvas(getById("winyh"), {
        height:500,
        allowTaint: true,
        useCORS: true,
      }).then((canvas) => {
        let base64url = canvas.toDataURL('image/jpeg', 1.0 );
        // document.body.appendChild(canvas);
      });

base64url 就是 待上传到服务端的 url