PHP 实现页面无刷新上传文件

html部分

index.html

<title>无刷新上传文件</title>
<meta content-type="text/html" charset="utf-8">
<script type="text/javascript">
function startUpload() {
document.getElementById('processing').innerHTML = 'loding...';
return true;
}
function stopUpload(rel){
var msg;
switch (rel) {
case 0:
msg = "上传成功";
break;
case 1:
msg = "上传的文件超过限制";
break;
case 2:
msg = "只能上传图片文件";
break;
default:
msg = "上传文件失败";
}
document.getElementById('processing').innerHTML = msg;
}
</script>
<p style="text-align:center">
</p><p id="processing"></p>
<form action="upload.php" method="post" enctype="multipart/form-data" target="form-target" onsubmit="startUpload();">
<input type="hidden" name="MAX_FILE_SIZE" value="1000000">
<input type="file" name="myfile">
<input type="submit" name="sub" value="上传">
</form>
<iframe style="width:0; height:0; border:0;" name="form-target"></iframe>
<p></p>

PHP 部分

upload.php

<!--?php
sleep(2);
$fileTypes = array('jpg','png','gif','bmp');
$result = null;
$uploadDir = './upload';
$maxSize = 1 * pow(2,20);
if ($_SERVER['REQUEST_METHOD'] == 'POST' && isset($_POST['sub'])) {
$myfile = $_FILES['myfile'];
$myfileType = substr($myfile['name'], strrpos($myfile['name'], ".") + 1);
if ($myfile['size'] --> $maxSize) {
$result = 1;
} else if (!in_array($myfileType, $fileTypes)) {
$result = 2;
} elseif (is_uploaded_file($myfile['tmp_name'])) {
$toFile = $uploadDir . '/' . $myfile['name'];
if (@move_uploaded_file($myfile['tmp_name'], $toFile)) {
$result = 0;
} else {
$result = -1;
}
} else {
$result = 1;
}
}
?>
<script type="text/javascript">
window.top.window.stopUpload(<?php echo $result; ?>);
</script>

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