blob 数据下载

zip

exportExcel({ taskId: '1-ef4a-1', tableName: '1result', exportName: '指标' }).then(res => {
        const content = res
        const blob = new Blob([content])
        const fileName = '预警指标结果.zip'
        let data = res
        let that = this
        let fileReader = new FileReader()
        fileReader.onload = function (e) {
          try {
            let jsonData = JSON.parse(e.target.result) // 说明是普通对象数据，后台转换失败
            if (jsonData.code != 200) {
              that.loading = false
              that.$message.warning(jsonData.trace)
            }
          } catch (err) {
            // 解析成对象失败，说明是正常的文件流
            // that.downloadFile(res, map)
            that.loading = false
            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)
            }
          }
        }
        fileReader.readAsText(data)
      }).catch(e => {
        console.log('e=', e)
      })