用js 实现下载

<a href="#">点击下载此文件</a> 怎么实现？指定的文件比如点击链接下载 a.pdf

解决方案 »

免费领取超大流量手机卡，每月29元包185G流量+100分钟通话, 中国电信官方发货

<a href="a.pdf">点击下载此文件</a>
<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default"  Debug="true"%>
<!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 runat="server">
    <title>无标题页</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <a href="#" onclick="location='?id=1';">下载</a>
    </div>
    </form>
</body>
</html>
using System;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.IO;public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (Request.Params["id"] != null)
        {
            //可以先判断是不是从本页面点击下载的，不是的话就不准下载了
            //string id = "1";//对应一个下载文件的编号            if (Request.Params["id"].ToString()=="1")
                DownLoad(@"e:\1.txt");
        }
    }    private void DownLoad(string filePath)
    {
        Response.Clear();
        string fileName = Path.GetFileName(filePath);
        FileStream fs = new FileStream(filePath, FileMode.Open);
        byte[] bytes = new byte[(int)fs.Length];
        fs.Read(bytes, 0, bytes.Length);
        fs.Close();
        Response.ContentType = "application/octet-stream";
        Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlDecode(fileName, System.Text.Encoding.UTF8));
        Response.BinaryWrite(bytes);
        Response.Flush();
        Response.End();
    }
}
如果指定是要下载 pdf 文件
可以把Response.ContentType = "application/octet-stream";
改成 Response.ContentType = "application/pdf";这样如果你的浏览器装了pdf文件查看器，就支持直接打开了，我们一般文件打印就是这样做的
恩，应该是我装了 pdf查看器。就直接链接就可以了。