前端接口二进制流文件保存文件

xxx.subscribe( (res) => {

    let file = new Blob([result.body], { type: result.body.type});
    let link = this.renderer2.createElement('a');
    let tempFile = window.URL.createObjectURL(file);
    this.renderer2.setAttribute(link, 'href', tempFile);
    this.renderer2.setAttribute(link, 'download', result.headers.get('Content-Disposition').split('filename=')[1]);
    link.click();
    window.URL.revokeObjectURL(tempFile); //手动释放内存，必须
})

exportData(body: any): Observable<HttpResponse<Blob>> {
    let url = 'example.com/downloadApi';
    return this.http.post(url, body, { responseType: 'blob' ， observe: 'response'});
}