<html>
<head>
  <meta charset="UTF-8">
  <title>上传多图片</title>
</head>
<body>
<form id="userForm" method="post" action="" enctype="multipart/form-data" class="bl-form bl-formhor fl">
  <input type="text" id="text" name="aa" value="">
  <input type="file" name="file" />
  <input type="button" value="提交"  class="mg btn btn2 d2-5" onclick="ajaxSubmitForm();"/>
</form>
</body>
<script src="js/jquery.min.js"></script>
<script src="http://malsup.github.com/jquery.form.js"></script>
<script>
    function ajaxSubmitForm() {
        var option = {
            url: '...',//接口
            type: 'POST',
            dataType: 'json',
            headers: {"ClientCallMode": "ajax"}, //添加请求头部
            success: function (data) {
                console.log(data);
                alert("企业用户升级失败,请联系管理员!");
            }
        };
        $("#userForm").ajaxSubmit(option);
        return false; //最好返回false,因为如果按钮类型是submit,则表单自己又会提交一次;返回false阻止表单再次提交
    }
</script>
</html>