 (var i = 0; i < 10; i++) {
                    xAxisData.push('类目' + i);
                    data1.push((Math.random() * 5).toFixed(2));
                    data2.push(-Math.random().toFixed(2));
                    data3.push((Math.random() + 0.5).toFixed(2));
                    data4.push((Math.random() + 0.3).toFixed(2));
                }

                var itemStyle = {
                    normal: {
                        label: {
                            show: true,
                       