const canvas = await html2canvas(element, {
        useCORS: true,
        scale: 2, 
        backgroundColor: '#ffffff',
        allowTaint: true,
        foreignObjectRendering: false,
        imageTimeout: 0, 
        logging: false,
        quality: 1.0,
      })


      const cropCanvas = document.createElement('canvas')
      const cropHeight = canvas.height - 5 
      cropCanvas.width = canvas.width
      cropCanvas.height = cropHeight
      const ctx = cropCanvas.getContext('2d')
      ctx.mozImageSmoothingEnabled = false
      ctx.webkitImageSmoothingEnabled = false
      ctx.msImageSmoothingEnabled = false
      ctx.imageSmoothingEnabled = false
      ctx.drawImage(canvas, 0, 0, canvas.width, cropHeight, 0, 0, canvas.width, cropHeight)



      const base64Data = cropCanvas.toDataURL('image/png', 1.0)
      imageUrl.value = base64Data

图片可以正常展示出来 但是长按保存和分享朋友都会提示保存失败