ajax如何上传文件

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PHP：

<?php
/**
* Created by PhpStorm.
* User: DELL
* Date: 2017/11/23
* Time: 10:57
*/
header("Access-Control-Allow-Origin:*");
// 响应类型
header('Access-Control-Allow-Methods:POST');
// 响应头设置
header('Access-Control-Allow-Headers:x-requested-with, content-type');
header("Content-type: text/html; charset=utf-8");
$file = $_FILES["file"];
$name = iconv('utf-8', 'gb2312', "upload/" . $file["name"]);
move_uploaded_file($file['tmp_name'], $name);
move_uploaded_file($file['tmp_name'], "upload/" . $file["name"]);
echo $file["name"];
die();

html：

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1,user-scalable=0">
<title>Title</title>
<script src="http://cdn.bootcss.com/jquery/3.1.1/jquery.min.js"></script>
</head>
<body>
<input type="file" id="fileS" name="file" accept="image/*">
<button>提交</button>
</body>
<script>
$(() => {
$("button").click(() => {
let formdata = new FormData();
formdata.append('file', $("#fileS")[0].files[0]);
$.ajax({
url: "./file_updata.php",
type: "post",
data: formdata,
contentType: false,
processData: false,
mimeType: "multipart/form-data",
success: function (data) {
console.log(data)
},
error: function (error) {
console.log("error", error)
}
}
)
})
})
</script>
</html>