前端解决浏览器下载文件名称问题

// 下载doc url
let href = “base64编码”
let fileName = "文件名.doc
// 下载 doc
this.http.get(href, {
  observe: 'response',
  responseType: 'blob',
}).subscribe(res:Blob => {
// 返回的数据流为Blob
  const file = decodeURIComponent(fileName);
  this._FileSaverService.save(res.body, file);
  this.isDownload = false;
}, err => {
  this.isDownload = false;
  this.message.create('error', '下载失败！');
});