通过ajax下载文件流本地封装的word和excel有问题

因为后台请求都得在header里面加token,普通的跳转url header加不上token会提示没有权限无法下载，
后来找见一篇通过ajax下载文件转成blob对象本地封装的办法，但是每次打开都会提示

            代码如下

            ```
                downloadWord(row.id)
    .then((res) => { // 处理返回的文件流
      const content = res.data
      let temp = res.headers["content-disposition"]
      let isExcel = temp.indexOf(".xlsx") > 0 || temp.indexOf(".xls") > 0
      let isWord = temp.indexOf(".docx") > 0 || temp.indexOf(".doc") > 0
      let file = {}
      if(isExcel){
        file.type = 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;charset=utf-8'
        file.name = temp.indexOf(".xlsx") > 0 ? 'xlsx' : 'xls'
      }else if(isWord){
        file.name = temp.indexOf(".docx") > 0 ? 'docx' : 'doc'
        file.type = 'application/msword;charset=UTF-8'
      }
      // const blob = new Blob([content], {type: res.data.type})
      const blob = new Blob([content], {type: file.type})
      const fileName = `${row.title}.${file.name}`
      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)
      }
  })
        ```

http://yuwenlin.iteye.com/blog/2275289