ta.push('类目' + -1);
                data1.push('-');
                data2.push('-');
                data3.push('-');

                for (var i = 0; i < 5; i++) {
                    xAxisData.push('类目' + i);
                    data1.push((-Math.random() - 0.2).toFixed(3));
                    data2.push((Math.random() + 0.3).toFixed(3));
                    data3.push((Math.random() + 0.2).toFixed(3));
                }

                xAxisData.push('类目' + i);
                data1.push('