JS下载文件|无刷新下载文件示例代码_javascript技巧

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:
代码如下:

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";

}



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