<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<script src="jquery.js"></script>
</head>
<body>
<form action="1.php" method="post" enctype="multipart/form-data" target="mywin">
<input type="file" name="up_file">
<!-- <input type="submit" name="btn" value="上传">
<input type="hidden" name="path" value=""> -->
</form>
<div>
<img id="imgid" style="width: 100px;height: 100px; display: none;" >
</div>
<iframe frameborder="1" name="mywin" style="display:none;" src=""></iframe>
</body>
<script>
$(document).ready(function(){
$(":file").change(function(){
$("form").submit();
});
});
</script>
<script>
</script>
</html>
<?php
header(‘Content-type:text/html;charset="utf8"‘);
// session_start();
if(!is_dir(‘uploads‘)){
mkdir(‘uploads‘);
}
$src=$_FILES[‘up_file‘][‘tmp_name‘];
$file=$_FILES[‘up_file‘][‘name‘];
$a=explode(‘.‘,$file);
$ext=array_pop($a);
$rand=time().mt_rand().‘.‘.$ext;
$dst="uploads/{$rand}";
if($_FILES[‘up_file‘][‘error‘]===0){
if(move_uploaded_file($src,$dst)){
echo "<script>imgid=window.top.document.getElementById(‘imgid‘);
imgid.src=‘{$dst}‘</script>";
}else{
echo "头像未上传成功";
}
}
上传图片（阿贾克斯提交）
原文地址：https://www.cnblogs.com/index0629/p/8111765.html