本文介绍了下载文件时，加载图标会一直显示的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
下载pdf文件时，加载图标会一直显示在页面中。下载文件时似乎触发了beforeunload功能。我的代码中会出现什么错误？
t1.php
When downloading a pdf file, loading icon keeps on displaying in the page. It seems like beforeunload function is getting triggered when downloading a file. What would be the mistake in my code?
t1.php
<html>
<head>
<script src="http://code.jquery.com/jquery-1.9.1.js" type="text/javascript"></script>
</head>
<body>
<script>
$(window).on('beforeunload', function(event) {
$('#loading').show();
});
$(window).on('load', function(event) {
$('#loading').hide();
});
</script>
<div id="loading">Loading...</div>
<a href="t1.php?pdf=<?php echo 'Intro.pdf';?>"><button>download</button></a>
<?php
if(isset($_GET['pdf'])){
$bbpdf = $_GET['pdf'];
header("Pragma: public"); // required
header("Expires: 0");
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header("Cache-Control: private", false); // required for certain browsers
header("Content-Type: application/pdf");
header("Content-Disposition: attachment; filename=\"" . basename($bbpdf));
header("Content-Transfer-Encoding: binary");
header("Content-Length: " . filesize($bbpdf));
ob_clean();
flush();
readfile($bbpdf);
}
?>
</body>
</html>推荐答案
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