原因：跨域后系統(tǒng)為了安全去掉自定義頭

解決方法：

django后臺
后端在返回response時，加上header Access-Control-Expose-Headers
如下：response['Content-Disposition'] ='' #自定義頭
response['Access-Control-Expose-Headers'] = "Content-Disposition" #Content-Disposition為自定義頭的key

response = HttpResponse(content=result, content_type="application/octet-stream", charset="utf-8")
                response['Content-Disposition'] = 'attachment; filename='+reports_name  # 自定義響應(yīng)頭
                response['Access-Control-Expose-Headers'] = "Content-Disposition"  # 通過此header允許前端訪問 解決跨域后系統(tǒng)為了安全去掉自定義頭
                return response

VUE前臺

    // 下載文件
    downloadReport(e) {
      this.$axios({
        method: "post",
        url: this.$path + "tests/batteryReportDownload/",
        data: {
        }
      }).then(res => {
          let headers = res.headers;
          let fileName = headers["content-disposition"];  #獲取自定義頭
      });
    },

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