微信企业号 html5 + ashx 下载文件

苹果上可直接打开docx,xlsx等文件

但安卓手机上无法下载，

哪位大侠指点一下？

多谢！

=========================主要代码：====================

1.

<a href='#'   onclick='downLoadFile(\"" + pDeptName + '\",\"' + pDocName + "\")'>" + pDocName + "</a>

2.

 function downLoadFile(deptname, docname) {            
            location.href = encodeURI("../ajax/downloadFile.ashx?op=docs_wx_download&deptname=" + deptname + '&docname=' + docname + '&channel=wx');
        }

3.

context.Response.Charset = "utf-8";              
context.Response.Clear();          
context.Response.ContentEncoding = Encoding.UTF8;              
context.Response.ContentType = "application/octet-stream";           
context.Response.AddHeader("Content-Disposition", string.Format("attachment; filename=" + HttpUtility.UrlEncode(fname, System.Text.Encoding.UTF8) )   );
context.Response.WriteFile(fnamefull);
context.Response.Flush();               
context.Response.End();