JS下载文件|无刷新下载文件示例代码

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:

复制代码代码如下:

 
<!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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