我正在使用AWS s3存储桶，当我使用var form_data = new FormData(this);时它工作正常，但是当我使用这样的表单附加时，它却无法工作，
var form_data = new FormData();
form_data.append('key', filename);
form_data.append('acl', 'public-read');
form_data.append('Content-Type', the_file.type);
form_data.append("file", the_file);
form_data.append("success_action_status", 201);
form_data.append("policy", $('input[name=policy]').val());
form_data.append("X-amz-credential", $('input[name=X-amz-credential]').val());
form_data.append("X-amz-algorithm", $('input[name=X-amz-algorithm]').val());
form_data.append("X-amz-date", $('input[name=X-amz-date]').val());
form_data.append("X-amz-expires", $('input[name=X-amz-expires]').val());
form_data.append("X-amz-signature", $('input[name=X-amz-signature]').val());
我需要使用表单附加，因为我在一种表单中上传了很多文件，因此我无法在一种表单中使用多种表单，这是我的aws s3上传的完整代码，任何人都可以帮助我如何工作带有表单追加？
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Untitled Document</title>
<style type="text/css">
h1{text-align:center}
.form-wrp {width: 350px;margin: 30px auto 0px;background: #02cce6;padding: 20px;}
#results span{padding: 20px;background: #00bfd8;margin: 5px 0;text-align: center;box-shadow: inset 0px 0px 3px 0px rgba(0, 0, 0, 0.06);border: 1px solid #00b4cc;display: block;}
</style>
</head>
<body>
<?php
$access_key = "********"; //User Access Key
$secret_key = "**********"; //secret key
$my_bucket = "******"; //bucket name
$region = "ap-south-1"; //bucket region
$allowd_file_size = "1048579, 10485760";
$short_date = gmdate('Ymd'); //short date
$iso_date = gmdate("Ymd\THis\Z"); //iso format date
$expiration_date = gmdate('Y-m-d\TG:i:s\Z', strtotime('+1 hours')); //policy expiration 1 hour from now
$presigned_url_expiry = 3600; //Presigned URL validity expiration time (3600 = 1 hour)
$policy = array(
'expiration' => gmdate('Y-m-d\TG:i:s\Z', strtotime('+6 hours')),
'conditions' => array(
array('bucket' => $my_bucket),
array('acl' => 'public-read'),
array('starts-with', '$key', ''),
array('starts-with', '$Content-Type', ''),
array('success_action_status' => '201'),
array('x-amz-credential' => implode('/', array($access_key, $short_date, $region, 's3', 'aws4_request'))),
array('x-amz-algorithm' => 'AWS4-HMAC-SHA256'),
array('x-amz-date' => $iso_date),
array('x-amz-expires' => '' . $presigned_url_expiry . ''),
));
$policybase64 = base64_encode(json_encode($policy));
$kDate = hash_hmac('sha256', $short_date, 'AWS4' . $secret_key, true);
$kRegion = hash_hmac('sha256', $region, $kDate, true);
$kService = hash_hmac('sha256', "s3", $kRegion, true);
$kSigning = hash_hmac('sha256', "aws4_request", $kService, true);
$signature = hash_hmac('sha256', $policybase64, $kSigning);
?>
<h1>Ajax Upload to Amazon AWS S3</h1>
<div class="form-wrp">
<div id="results"> server response here </div>
<form action="https://<?= $my_bucket ?>.s3-<?= $region ?>.amazonaws.com" method="post" id="aws_upload_form" enctype="multipart/form-data">
<input type="hidden" name="acl" value="public-read">
<input type="hidden" name="success_action_status" value="201">
<input type="hidden" name="policy" value="<?= $policybase64 ?>">
<input type="hidden" name="X-amz-credential" value="<?= $access_key ?>/<?= $short_date ?>/<?= $region ?>/s3/aws4_request">
<input type="hidden" name="X-amz-algorithm" value="AWS4-HMAC-SHA256">
<input type="hidden" name="X-amz-date" value="<?= $iso_date ?>">
<input type="hidden" name="X-amz-expires" value="<?= $presigned_url_expiry ?>">
<input type="hidden" name="X-amz-signature" value="<?= $signature ?>">
<input type="hidden" name="key" value="">
<input type="hidden" name="Content-Type" value="">
<input type="file" name="file" />
<input type="submit" value="Upload File" />
</form>
</div>
<script type="text/javascript" src="//code.jquery.com/jquery-2.2.4.min.js"></script>
<script>
$("#aws_upload_form").submit(function (e) {
e.preventDefault();
the_file = this.elements['file'].files[0];
var filename = Date.now() + '.' + the_file.name.split('.').pop();
$(this).find("input[name=key]").val(filename);
$(this).find("input[name=Content-Type]").val(the_file.type);
var post_url = $(this).attr("action"); //get form action url
var form_data = new FormData(this); //Creates new FormData object
//alert($('input[name=policy]').val());
var form_data = new FormData();
form_data.append('key', filename);
form_data.append('acl', 'public-read');
form_data.append('Content-Type', the_file.type);
form_data.append("file", the_file);
form_data.append("success_action_status", 201);
form_data.append("policy", $('input[name=policy]').val());
form_data.append("X-amz-credential", $('input[name=X-amz-credential]').val());
form_data.append("X-amz-algorithm", $('input[name=X-amz-algorithm]').val());
form_data.append("X-amz-date", $('input[name=X-amz-date]').val());
form_data.append("X-amz-expires", $('input[name=X-amz-expires]').val());
form_data.append("X-amz-signature", $('input[name=X-amz-signature]').val());
$.ajax({
url: post_url,
type: 'post',
datatype: 'xml',
data: form_data,
contentType: false,
processData: false,
//crossDomain:true,
xhr: function () {
var xhr = $.ajaxSettings.xhr();
if (xhr.upload) {
var progressbar = $("<div>", {style: "background:#607D8B;height:10px;margin:10px 0;"}).appendTo("#results"); //create progressbar
xhr.upload.addEventListener('progress', function (event) {
var percent = 0;
var position = event.loaded || event.position;
var total = event.total;
if (event.lengthComputable) {
percent = Math.ceil(position / total * 100);
progressbar.css("width", +percent + "%");
}
}, true);
}
return xhr;
}
}).done(function (response) {
var url = $(response).find("Location").text(); //get file location
var the_file_name = $(response).find("Key").text(); //get uploaded file name
$("#results").html("<span>File has been uploaded, Here's your file <a href=" + url + ">" + the_file_name + "</a></span>"); //response
}).error(function () {
console.log(arguments);
});
});
</script>
</body>
</html>