option = { xAxis: { type: 'category', boundaryGap: false, data: ['00:00', '01:15', '02:30', '03:45', '05:00', '06:15', '07:30', '08:45', '10:00', '11:15', '12:30', '13:45', '15:00', '16:15', '17:30', '18:45', '20:00', '21:15', '22:30', '23:45'] }, yAxis: { type: 'value', axisLabel: { formatter: '{value} W' } }, visualMap: { show: false, seriesIndex:0, dimension: 0, pieces: [{ gt: 0, lte: 8, color: 'red' }, { gt: 8, color: 'transparent' }] }, series: [ { name:'用电量', type:'line', smooth: true, data: [300, 280, 250, 260, 270, 300, 550, 500, 400, 390, 380, 390, 400, 500, 600, 750, 800, 700, 600, 400], }, { name:'用电量', type:'line', smooth: true, data: [300, 280, 250, 260, 270, 300, 550, 500, 400, 390, 380, 390, 400, 500, 600, 750, 800, 700, 600, 400], lineStyle:{ normal:{ type:'dotted' } } } ] };