span style="font-family: verdana, 'ms song', 宋体, Arial, 微软雅黑, Helvetica, sans-serif; font-size: 14px; line-height: 21px; text-align: left; background-color: rgb(255, 254, 247); ">avascript部分/span>

!doctype html>
html>
head>
meta charset=utf-8>
head>
title>ajax 文件上传~~/title>
/head>
script>
window.onload=function(){
var form=document.getElementsByTagName('form')[0];
form.onsubmit=function(){
var iframe=document.createElement('iframe');
iframe.src='do_upload.php';
var iframe_name="iframe"+Math.random();
iframe.name=iframe_name;
document.body.appendChild(iframe);
iframe.style.width='0px';
iframe.style.height='0px';
iframe.frameBorder='0';
form.target=iframe_name;
}
}
/script>
body>
form enctype='multipart/form-data' method='post' action='do_upload.php'>
请选择文件:input type='file' name='myFile'/>br/>
input type='submit'/>
div id='msg'>/div>
/form>
/body>
/html>

?php
$up_file=$_FILES['myFile'];
if($up_file['error']===0){
if(!file_exists('./imgs')){
mkdir('./imgs');
}
$save_name=rand().$up_file['name'];
$bool=move_uploaded_file($up_file['tmp_name'],"./imgs/$save_name");
if($bool){
$msg='上传成功!';
}else{
$msg='上传失败!';
}
}
echo
"script>
var msg=parent.document.getElementById('msg');
msg.innerHTML='font color=red>$msg/forn>';
/script>";
?>