LARAVE AJAX 上传 又拍云 file 文件类型

<form action="/upFapaiAction" method="post" id="upimg" enctype="multipart/form-data" role="form">
    {!! csrf_field() !!}
    <h1 id="overview" class="page-header">又拍云单图&多图上传</h1>
    <div class="form-group">
        <label for="exampleInputFile">图片上传</label>
        <input  type="file" name="myfile[]" multiple id="exampleInputFile">
    </div>
    <button type="submit" class="btn btn-success">提交</button>
    <div><a href="javascript:go()"> AAA </a></div>
</form>
<script>
    function go(){
        var formData = new FormData(document.getElementById("upimg"));
        $.ajax({
            type : "POST",
            url : "/upFapaiAction",
            data : formData,
            async: false,
            cache: false,
            contentType: false,
            processData: false,
            success : function(msg) {
                console.log('msg->',msg);
            }
        });
    }
</script>