var $form = $('#j-form');
    var $file = $('#j-file');
    var $status = $('.j-status');
    $file.makeThumb({
        width: 400,
        height: 400,
//        mark: {padding: 5, src: 'mark.png', width: 30, height: 30},
        success: function(dataURL, tSize, file, sSize, fEvt) {
            // post data
            var $up = $('<input type="hidden" name="base64">');
            $up.insertAfter($file).val(dataURL);
            $file.remove();
            var load = layer.open({type: 2,content: '上传中'});
            $.ajax({
                url: "api.php",
                data: $form.serialize(),
                method: "POST",
                async : true,
                dataType : "json",
                success: function (data) {
                    layer.close(load);
                    $("#ret").html(data.msg);
                    console.log(data);
                }

            });
//            $form.submit();
        }
    });