axios ( {
     method : 'post',
     url : api.exportPlayTime , // 请求地址
     data : {
      choose : type,
      begindate : startDate,
      enddate : endDate
     },
     responseType : 'arraybuffer',
     observe: 'response',
    } )
     .then ( ( res ) => {

      const fileName = ""+filename+".xlsx"
      let blob = new Blob([res.data], {type: "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"});
      if ( 'download' in document.createElement ( 'a' ) ) { // 非IE下载
       const elink = document.createElement ( 'a' )
       elink.download = fileName
       elink.style.display = 'none'
       elink.href = URL.createObjectURL ( blob )
       document.body.appendChild ( elink )
       elink.click ()
       URL.revokeObjectURL ( elink.href ) // 释放URL 对象
       document.body.removeChild ( elink )
      } else { // IE10+下载
       navigator.msSaveBlob ( blob, fileName )
      }
     })

download(data) {
    if (!data) {
     return
    }
    let url = window.URL.createObjectURL(new Blob([data]))
    let link = document.createElement('a')
    link.style.display = 'none'
    link.href = url
    link.setAttribute('download', 'excel.xlsx')

    document.body.appendChild(link)
    link.click()
   },