var a = document.createElement("a");a.；a.download ="test.mp3";a.click();

public void downFiles(HttpServletResponse response,String url,String workInfoId,int type){  try{   String prefix = type == 1 ? "wav" : "txt";   url = type == 1 ? url : (url + "?textInfoId="+workInfoId);   HttpEntity entity = Request.Get(url).     execute().returnResponse().getEntity();   byte[] bys = EntityUtils.toByteArray(entity);   //獲取作品名稱   Works works = this.worksDao.findByWorkId(workInfoId);   String name = (works!=null && StringUtils.isNotBlank(works.getName())) ? works.getName() : Long.toString(new Date().getTime());   response.setHeader("Content-Disposition", "attachment; filename="+ new String(name.getBytes("utf-8"), "ISO-8859-1")+"."+prefix);   OutputStream out = response.getOutputStream();   out.write(bys);   out.close();  }catch (Exception e){   e.printStackTrace();  } }