index.html

<!DOCTYPE html>
<html>

<head>
    <title>Index</title>
    <style type="text/css">
    </style>
</head>

<body>
<div>
    <input type="file" name="photo" id="photo" value="" placeholder="免冠照片">
    <input type="button" onclick="postData();" value="下一步" name="" style="width:100px;height:30px;">
</div>
　<script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>
<script type="text/javascript">
    function postData() {
        var formData = new FormData();
        formData.append("photo", $("#photo")[0].files[0]);
        formData.append("service", 'App.Passion.UploadFile');
        console.log(132,formData)
        $.ajax({
            url: '#', /*接口域名地址*/
            type: 'post',
            data: formData,
            contentType: false,
            processData: false,
            success: function (res) {
                console.log(res.data);
                if (res.data["code"] == "succ") {
                    alert('成功');
                } else if (res.data["code"] == "err") {
                    alert('失败');
                } else {
                    console.log(res);
                }
            }
        })
    }
</script>


</body>

</html>