layui 防止多次提交，用遮罩

        var serializeArray = form.serializeArray();
        var index = layer.load();
        $.post(url, serializeArray, function (result) {
            if(200 == result.code) {
                result.data = 'submit[refresh]';
                $.fn.Messager(result);
            } else {
                $.fn.Messager(result);
                layer.close(index);
            }
        });

顶层遮罩：