qrcodejs2 生成二维码 并上传oss

const loading = this.$loading({
          lock: true,
          text: 'Loading',
          spinner: 'el-icon-loading',
          background: 'rgba(0, 0, 0, 0.7)'
        })
        document.getElementById(`canvas${index}`).innerHTML = ''
        const qrcode = new QRCode(`canvas${index}`, {
          width: 120,
          height: 120,
          text: encodeURI(`www.baidu.com/?from=${item.iden}`), // 二维码地址
          colorDark: '#ffffff', // 前景色
          colorLight: '#ffffff', // 后景色
          correctLevel: QRCode.CorrectLevel.H
        })
        setTimeout( () => {
          console.log(qrcode._el.childNodes[1].src)
          var file = this.base64ToFile(qrcode._el.childNodes[1].src)
          let formData = new FormData()
          formData.append('file', file)
          upOssImage(formData).then(res => {
            loading.close()
            item.img = res
          }).catch(() => {
            this.$message.error('上传图片失败')
          })
        }, 500)
        ```
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