js php实现无刷新下载功能

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我是靠谱客的博主健壮人生，这篇文章主要介绍js php实现无刷新下载功能，现在分享给大家，希望可以做个参考。

js结合php实现下载功能

服务端

步骤就是，设置头文件参数，然后读入并输出文件。下面代码的file_get_contents可以使用fread，fclose代替。

download.php

复制代码<?php
$filename = $_GET['filename'];
$path = __DIR__."/file/".$filename;
header( "Content-type: application/octet-stream");
header( "Accept-Ranges: bytes ");
header( "Accept-Length: " .filesize($filename));
header( "Content-Disposition: attachment; filename={$filename}");
echo file_get_contents($filename);1
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<?php
$filename = $_GET['filename'];
$path = __DIR__."/file/".$filename;
header( "Content-type: application/octet-stream");
header( "Accept-Ranges: bytes ");
header( "Accept-Length: " .filesize($filename));
header( "Content-Disposition: attachment; filename={$filename}");
echo file_get_contents($filename);
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客户端

在很多时候，我们下载文件的操作，都是在前端页面直接点击下载的，而不是专门跳转到上面的download.php去下载。

所以我们需要在前端实现无刷新访问download.php来下载文件，通过隐藏的iframe来实现是不错的方式。下面是代码：

复制代码<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <title>Title</title>
</head>
<body>
<a href="javascript:download_file('http://localhost/download.php?filename=" rel="external nofollow" 测试文件.doc"')">下载</a>
<script type="text/javascript">
  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>
</body>
</html>1
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<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <title>Title</title>
</head>
<body>
<a href="javascript:download_file('http://localhost/download.php?filename=" rel="external nofollow" 测试文件.doc"')">下载</a>
<script type="text/javascript">
  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>
</body>
</html>
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