option = { xAxis: { data: ['a', 'b', 'c', 'd'] }, yAxis: { }, series: [{ type: 'line', data:[1, 10, 4, 3], markPoint: { data: [{ type: 'min', itemStyle: { normal: { color: 'green' } } }] } }], markPoint: { z: -1 // 强制显示在底部 } };