vue 文件下载

this.download(api.baseURL + api.EXT_DEVICE_PRO_DATA,'设备运行数据-'+ this.extData+'.xlsx')

download(url, fileName) {
        let x = new XMLHttpRequest();
        x.open("GET", url, true);
        x.responseType = 'blob';
        x.onload = function(e) {
          let url = window.URL.createObjectURL(x.response)
          let a = document.createElement('a');
          a.href = url
          a.download = fileName
          a.click()
        }
        x.send();
      },