axios调用后端下载接口(在请求体中加上responseType: "blob")
export const fileDownload = (data) => request({ method: "post", url: "/heritage/fileDownload", responseType: "blob", data, });把后端返回的二进制流数据转换成一个blob对象，再去进行下载；
1.封装下载函数
// data: 接口返回的二进制流数据// fileName：自定义下载完成后的文件名// fileType：要下载的文件类型downloadFile(data, fileName, fileType) { let blob = new Blob([data], { type: `${fileType};charset=utf-8`});// type指定下载文件的类型 let downloadElement = document.createElement("a"); let href = window.URL.createObjectURL(blob); downloadElement.href = href; downloadElement.download = fileName; document.body.appendChild(downloadElement); downloadElement.click(); document.body.removeChild(downloadElement); window.URL.revokeObjectURL(href);}2. 当后端下载接口请求完成后，调用1中的下载函数并传入对应参数;
new Blob的参数type类型:async courseDownload() { // 调用后端接口 const res = await fileDownload(); // 此处的fileType可以动态获取响应头中对应的文件名称 const filename = "测试文件"; // 自定义下载文件名称 // 此处的fileType可以动态获取响应头中对应的文件类型 const fileType = "application/zip" // 下载zip格式的文件 this.downloadFile(res, filename, fileType);},//作者：夹板儿孩//链接：https://www.jianshu.com/p/6896ade6299b// 全面的类型：https://www.iana.org/assignments/media-types/media-types.xhtml123 application/vnd.lotus-1-2-33gp video/3gppaab application/x-authoware-binaam application/x-authoware-mapaas application/x-authoware-segai application/postscriptaif audio/x-aiffaifc audio/x-aiffaiff audio/x-aiffals audio/X-Alpha5amc application/x-mpegani application/octet-streamasc text/plainasd application/astoundasf video/x-ms-asfasn application/astoundasp application/x-asapasx video/x-ms-asfau audio/basicavb application/octet-streamavi video/x-msvideoawb audio/amr-wbbcpio application/x-bcpiobin application/octet-streambld application/bldbld2 application/bld2bmp 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