JS下载文件|无刷新下载文件

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后台代码Handler.ashx

<%@ WebHandler Language="C#" Class="Handler" %>using System;using System.Web;public class Handler : IHttpHandler {        public void ProcessRequest (HttpContext context) {        string fileName = "web.config";//客户端保存的文件名           string filePath = context.Server.MapPath("web.config");//路径          //以字符流的形式下载文件           System.IO.FileStream fs = new System.IO.FileStream(filePath, System.IO.FileMode.Open);        byte[] bytes = new byte[(int)fs.Length];        fs.Read(bytes, 0, bytes.Length);        fs.Close();        context.Response.ContentType = "application/octet-stream";        //通知浏览器下载文件而不是打开           context.Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));        context.Response.BinaryWrite(bytes);        context.Response.Flush();        context.Response.End();     }     public bool IsReusable {        get {            return false;        }    }}

前端代码:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head>    <script src="jquery-1.7.2.min.js" type="text/javascript"></script>    <title></title>    <script>        function download_file(url)        {            if (typeof (download_file.iframe) == "undefined")            {                var iframe = document.createElement("iframe");                download_file.iframe = iframe;                document.body.appendChild(download_file.iframe);            }            // alert(download_file.iframe);            download_file.iframe.src = url;            download_file.iframe.style.display = "none";        }    </script></head><body><a href="javascript:void(0);" onclick="download_file('Handler.ashx')">aaaaa</a><a href="javascript:void(0);" onclick="download_file('Handler.ashx')">bbbbb</a><a href="javascript:void(0);" onclick="download_file('Handler.ashx')">ccccc</a></body></html>

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