echarts 設定柱狀圖寬度

option={
  series:[
    {
                        barWidth: 20,
                        name: "預警",
                        type: "bar",//柱狀圖
                        stack: "Search Engine",
                        data: [120, 132, 101, 134, 90, 230, 210],
                        color: '#435188',
                        barWidth: '60px' //設定柱狀圖寬度
                    }

 ]

}