【vue2】前端实现下载后端返回的application/octet-stream文件流

1、下载csv/txt时
此时无须修改接口的响应格式

let filenameRegex = /filename[^;=n]*=((['"]).*?2|[^;n]*)/;
let matches = filenameRegex.exec(data.headers['content-disposition']);
let blob = new Blob(['uFEFF' + data.data], {//目前只有csv格式
    type: 'text/csv;charset=utf-8'
})
var downloadElement = document.createElement('a');
var href = window.URL.createObjectURL(blob);
downloadElement.href = href;
downloadElement.download = matches[1].substring(0, matches[1].lastIndexOf('.'));
document.body.appendChild(downloadElement); 
downloadElement.click(); //注销掉
window.URL.revokeObjectURL(href); //清除生成的链接，会占用一些东西，不知道啥，反正运行慢点

2、下载Excel时，需要修改一下接口的响应格式为blob

axios({
  method: "POST",
   url: constants.url.QUERY_DESCRIBE_TEST_REPORT_DOWNLOAD,
   responseType: "blob",//FIXME 很重要
   timeout: 60000,
   data: {
     TestTaskId,
   },
 })
   .then((response) => {
     console.log("response", response);
     if (!response || !response.data) {
       self.$message({
         type: "error",
         message: "导出失败！",
       });
       return;
     }
     let filenameRegex = /filename[^;=n]*=((['"]).*?2|[^;n]*)/;
     let matches = filenameRegex.exec(
       response.headers["content-disposition"]
     );
     let blob = new Blob([response.data]);
     let downloadFilename = matches[1];
     if (window.navigator && window.navigator.msSaveOrOpenBlob) {
       //兼容ie浏览器
       window.navigator.msSaveOrOpenBlob(blob, downloadFilename);
     } else {
       //谷歌,火狐等浏览器
       let url = window.URL.createObjectURL(blob);
       let downloadElement = document.createElement("a");
       downloadElement.style.display = "none";
       downloadElement.href = url;
       downloadElement.download = downloadFilename;
       document.body.appendChild(downloadElement);
       downloadElement.click();
       document.body.removeChild(downloadElement);
       window.URL.revokeObjectURL(url);
     }
   })
   .catch((err) => {
     this.$message.error(err);
   });

另

{".3gp",    "video/3gpp"},
{".apk",    "application/vnd.android.package-archive"},
{".asf",    "video/x-ms-asf"},
{".avi",    "video/x-msvideo"},
{".bin",    "application/octet-stream"},
{".bmp",    "image/bmp"},
{".c",      "text/plain"},
{".csv",    "text/csv;charset=utf-8"},
{".class",  "application/octet-stream"},
{".conf",   "text/plain"},
{".cpp",    "text/plain"},
{".doc",    "application/msword"},
{".docx",   "application/vnd.openxmlformats-officedocument.wordprocessingml.document"},
{".xls",    "application/vnd.ms-excel"},
{".xlsx",   "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"},
{".exe",    "application/octet-stream"},
{".gif",    "image/gif"},
{".gtar",   "application/x-gtar"},
{".gz",     "application/x-gzip"},
{".h",      "text/plain"},
{".htm",    "text/html"},
{".html",   "text/html"},
{".jar",    "application/java-archive"},
{".java",   "text/plain"},
{".jpeg",   "image/jpeg"},
{".jpg",    "image/jpeg"},
{".js",     "application/x-javascript"},
{".log",    "text/plain"},
{".m3u",    "audio/x-mpegurl"},
{".m4a",    "audio/mp4a-latm"},
{".m4b",    "audio/mp4a-latm"},
{".m4p",    "audio/mp4a-latm"},
{".m4u",    "video/vnd.mpegurl"},
{".m4v",    "video/x-m4v"},
{".mov",    "video/quicktime"},
{".mp2",    "audio/x-mpeg"},
{".mp3",    "audio/x-mpeg"},
{".mp4",    "video/mp4"},
{".mpc",    "application/vnd.mpohun.certificate"},
{".mpe",    "video/mpeg"},
{".mpeg",   "video/mpeg"},
{".mpg",    "video/mpeg"},
{".mpg4",   "video/mp4"},
{".mpga",   "audio/mpeg"},
{".msg",    "application/vnd.ms-outlook"},
{".ogg",    "audio/ogg"},
{".pdf",    "application/pdf"},
{".png",    "image/png"},
{".pps",    "application/vnd.ms-powerpoint"},
{".ppt",    "application/vnd.ms-powerpoint"},
{".pptx",   "application/vnd.openxmlformats-officedocument.presentationml.presentation"},
{".prop",   "text/plain"},
{".rc",     "text/plain"},
{".rmvb",   "audio/x-pn-realaudio"},
{".rtf",    "application/rtf"},
{".sh",     "text/plain"},
{".tar",    "application/x-tar"},
{".tgz",    "application/x-compressed"},
{".txt",    "text/plain"},
{".wav",    "audio/x-wav"},
{".wma",    "audio/x-ms-wma"},
{".wmv",    "audio/x-ms-wmv"},
{".wps",    "application/vnd.ms-works"},
{".xml",    "text/plain"},
{".z",      "application/x-compress"},
{".zip",    "application/x-zip-compressed"},
{"",        "*/*"}