<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<script src="jq183.js"></script>
<script>
function ajaxup(){
var ifname = 'up'+Math.random();
$("<iframe name='"+ ifname +"'></iframe>").appendTo($('body'));
$('form:first').attr('target',ifname);
return false;
}
</script>
</head>
<body>
<form action="9.php" method="post" enctype="multipart/form-data" onsubmit="return ajaxup();">
<input type="file" name="pic"> <br> <br>
<input type="submit" value="GO">
</form>
</body>
</html>
我们众所周知后端error如果等于 相当于上传成功，所以暂时用一个临时数据来模拟下意思
<?php
if(empty($_FILES)){
exit('No file');
} echo $_FILES['pic']['error'] == 0 ? 'success':'error';
