  type:'line',
                        step: 'start',
                        data: echarts.util.map([120, 132, 101, 134, 90, 230, 210], function (value, index) {
                            return [index * 100, value];
                        })
                    }, {
                        xAxisIndex: 2,
                        yAxisIndex: 2,
                        name:'Step Middle',
                        type:'line',
                        step: 'middle',
                        data: echarts.uti