我们通过动态的创建iframe，修改form的target，来实现无跳转的文件上传。
具体的实现步骤
1.捕捉表单提交事件
2.创建一个iframe
3.修改表单的target,指向iframe
4.删除iframe
file.html代码如下：
<!DOCTYPE HTML>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<form action="upfile.php" method="post" id="upfileForm" enctype="multipart/form-data">
<input type="file" name="file" />
<input type="submit" name="submit" value="上传" />
</form>
<div id="result"></div>
</body>
<script type="text/javascript" src="./jquery.js"></script>
<script type="text/javascript">
$("#upfileForm").bind("submit", function() {
var ifrName = 'upfile' + Math.random();
var ifr = $("<iframe name='" + ifrName + "' width='0' height='0' frameborder='0'></iframe>");
$("body").append(ifr);
$(this).attr("target", ifrName);
});
</script>
</html>
<?php
$uploadDir = './upload/';
if(!file_exists($uploadDir)) {
@mkdir($uploadDir, 0777, true);
}
$uploadFile = $uploadDir . basename($_FILES['file']['name']);
if(move_uploaded_file($_FILES['file']['tmp_name'], $uploadFile)) {
echo "<script>parent.document.getElementById('result').innerHTML='OK';</script>";
} else {
echo "<script>parent.document.getElementById('result').innerHTML='NO';</script>";
}