option = { xAxis: { type: 'category', data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun'] }, yAxis: [{ type: 'value' }], tooltip:{ show:true }, series: [{ data: [120, 200, 150, 80, 70, 110, 130], type: 'bar', barWidth:50, yAxisIndex:0, itemStyle:{ color:new echarts.graphic.LinearGradient( 0, 0, 0, 1, [ {offset: 0, color: 'green'}, {offset: 1, color: '#ddd'} ] ) } },{ data: [100, 100, 100, 80, 60, 100, 120], type: 'bar', barWidth:30, yAxisIndex:0, z: 10, barGap :'-80%', itemStyle:{ color:new echarts.graphic.LinearGradient( 0, 0, 0, 1, [ {offset: 0, color: 'red'}, {offset: 1, color: '#ddd'} ] ) } }] };