echarts 柱状图，每根柱子显示不同颜色

option = {
title: {
text: ‘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()(256256*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],
}]

};