echarts 柱状图颜色

option = {
 
title: {
    text: '某地区降水量',
    subtext: '纯属虚构'
},
tooltip: {
    trigger: 'axis'
},
grid: {
    left: '3%',
    right: '4%',
    bottom: '3%',
    containLabel: true
},
xAxis: [{
    type: 'category',
    data: ['1月', '2月', '3月', '4月', '5月', '6月', '7月', '8月', '9月', '10月', '11月', '12月'],
    splitLine: {
        show: false
    },
    axisTick: {
        alignWithLabel: true
    }
}],
yAxis: [{
    type: 'value',
    splitLine: {
        show: false
    },
    splitArea: {
        show: true,
    },
}],
series: [{
    name: '降水量',
    type: 'bar',
    label: {
        normal: {
            show: true,
            position: 'top'
        }
    },
    itemStyle: {
        normal: {
            // 随机显示
            //color:function(d){return "#"+Math.floor(Math.random()*(256*256*256-1)).toString(16);}
          
            // 定制显示（按顺序）
            color: function(params) { 
                var colorList = ['#C33531','#EFE42A','#64BD3D','#EE9201','#29AAE3', '#B74AE5','#0AAF9F','#E89589','#16A085','#4A235A','#C39BD3 ','#F9E79F','#BA4A00','#ECF0F1','#616A6B','#EAF2F8','#4A235A','#3498DB' ]; 
                return colorList[params.dataIndex] 
            }
        },
    },
    data: [32.6, 25.9, 39.0, 26.4, 28.7, 70.7, 75.6, 82.2, 48.7, 58.8, 16.0, 32.3],
}]
};