iframe callback方式文件上传

1、前端default.html

<!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>
  <title> new document </title>
  <meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
  <meta name="generator" content="editplus" />
  <meta name="author" content="" />
  <meta name="keywords" content="" />
  <meta name="description" content="" />
  <script src="./qrcodejs/jquery.min.js"></script>
  <script>
	  function js_upload_callback(filename){
		document.getElementById('tip').innerHTML = filename;
	  }
  </script>
 </head>

 <body>
 <iframe name="frmClean_iframe" style="display:none"></iframe>
 <div id="tip"></div>
 <form action="upload_file.php" method="post" enctype="multipart/form-data" target="frmClean_iframe">
	<input type="file" name="file" id="file" />
	<input type="submit" name="submit" value="Submit" />
 </form>
 </body>
</html>

2、后台upload_file.php

<?php
echo '<script>window.parent.js_upload_callback( "'.$_FILES["file"]["name"].'");</script>';