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 class="lazyload" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC" data-original="http://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 class="lazyload" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC" data-original="' + ret['photo'] + '" width="100">';
$('#result').html(result);
}else{
alert('提交失敗');
}
}); return false;
}
--> </script>
</head>
<body>
<form name="form1" id="form1">
<p>name:<input type="text" name="name" ></p>
<p>gender:<input type="radio" name="gender" value="1">male <input type="radio" name="gender" value="2">female</p>
<p>photo:<input type="file" name="photo" id="photo"></p>
<p><input type="button" name="b1" value="submit" onclick="fsubmit()"></p>
</form>
<div id="result"></div>
</body></html>server.php
<?php$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);?>
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