                         'featureType': 'label',
                            'elementType': 'labels.text.fill',
                            'stylers': {
                                'color': 'rgba(0,0,0,0)'
                            }
                        }]
                    }
                }
            };

            var chart = testHelper.createChart(echarts, 'grid', option);


            function generateData() {
                var data = [];
                for (var i = 0; i < cellCount