a标签下载pdf

/**
 * 下载文件
 * @param url 文件路径
 * @param fileName 文件名
 * @param parameter
 * @returns {*}
 */
export function downloadFile(url, fileName, parameter) {
  return downFile(url, parameter).then((data) => {
    if (!data || data.size === 0) {
      Vue.prototype['$message'].warning('文件下载失败')
      return
    }
    if (typeof window.navigator.msSaveBlob !== 'undefined') {
      window.navigator.msSaveBlob(new Blob([data]), fileName)
    } else {
      let url = window.URL.createObjectURL(new Blob([data]))
      let link = document.createElement('a')
      link.style.display = 'none'
      link.href = url
      link.setAttribute('download', fileName)
      document.body.appendChild(link)
      link.click()
      document.body.removeChild(link) //下载完成移除元素
      window.URL.revokeObjectURL(url) //释放掉blob对象
    }
  })
}