formdata 对象，可以把form中所有表单元素的name与value组成一个querystring，提交到后台。在使用ajax提交时，使用formdata对象可以减少拼接querystring的工作量。
使用formdata对象
1.创建一个formdata空对象，然后使用append方法添加key/value
var formdata = new formdata();
formdata.append('name','fdipzone');
formdata.append('gender','male');
2.取得form对象，作为参数传入到formdata对象
<form name="form1" id="form1">
<input type="text" name="name" value="fdipzone">
<input type="text" name="gender" value="male">
</form>
var form = document.getelementbyid('form1');
var formdata = new formdata(form);
使用formdata提交表单及上传文件：
<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<title> formdata demo </title>
<script src="//code.jquery.com/jquery-1.11.0.min.js"></script>
<script type="text/javascript">
<!--
function fsubmit(){
var data = new formdata($('#form1')[0]);
$.ajax({
url: 'server.php',
type: 'post',
data: data,
datatype: 'json',
cache: false,
processdata: false,
contenttype: false
}).done(function(ret){
if(ret['issuccess']){
var result = '';
result += 'name=' + ret['name'] + '<br>';
result += 'gender=' + ret['gender'] + '<br>';
result += '<img src="' + ret['photo'] + '" width="100">';
$('#result').html(result);
}else{
alert('提交失敗');
}
});
return false;
}
-->
</script>
</head>
<body>
<form name="form1" id="form1">
<p>name:<input type="text" name="name" ></p>
<p>gender:<input type="radio" name="gender" value="1">male <input type="radio" name="gender" value="2">female</p>
<p>photo:<input type="file" name="photo" id="photo"></p>
<p><input type="button" name="b1" value="submit" onclick="fsubmit()"></p>
</form>
<p id="result"></p>
</body>
</html>
server.php
<?php
$name = isset($_post['name'])? $_post['name'] : '';
$gender = isset($_post['gender'])? $_post['gender'] : '';
$filename = time().substr($_files['photo']['name'], strrpos($_files['photo']['name'],'.'));
$response = array();
if(move_uploaded_file($_files['photo']['tmp_name'], $filename)){
$response['issuccess'] = true;
$response['name'] = $name;
$response['gender'] = $gender;
$response['photo'] = $filename;
}else{
$response['issuccess'] = false;
}
echo json_encode($response);
?>
以上就是使用formdata提交表单及上传图片的方法的详细内容。