文件流下载（blob）_c# 下载blob文件

downloadFile () {
    const _this = this
    axios({
      url: this.url,
      method: this.method,
      responseType: 'blob',
      params: this.method === 'get' ? this.data : undefined,
      data: this.method === 'post' ? this.data : undefined
    }).then(res => {
      const fileData = res.data
      const fileReader = new FileReader()
      fileReader.onload = function () {
        try {
          const jsonData = JSON.parse(this.result)
          if (jsonData.error) {
            throw new Error(`${jsonData.error.message}`)
          }
        } catch {
          // 解析成对象失败，说明是正常的文件流
          const content = res.data
          // 构造一个blob对象来处理数据
          const blob = new Blob([content]) 
          
          const link = document.createElement('a')
          // 获取headers中的filename文件名
          const temp = res.headers['content-disposition'].split(`filename*=UTF-8''`)[1]
          const fileName = decodeURIComponent(temp)
          link.style.display = 'none'
          link.href = URL.createObjectURL(blob)
          link.setAttribute('download', fileName)
          document.body.appendChild(link)
          link.click()
          document.body.removeChild(link)
        }
      }
      fileReader.readAsText(fileData)
    })
  }