vue echarts 柱状图 变色 显示

echartscustom2(id,title,xdata,ydata){
            var chartDom = document.getElementById(id);
            var myChart = echarts.init(chartDom);
            var option;
            option = {
                title:{
                    text:title,
                    left:"center"
                },
                tooltip: {
                    trigger: 'axis',
                    axisPointer: {
                        type: 'shadow'
                    },
                },
                xAxis: {
                    type: 'value',
                    axisLabel:{show:false}
                },
                yAxis: {
                    type: 'category',
                    data: ydata,
                    axisLabel:{show:false}
                },
                series: [{
                    data: xdata,
                    type: 'bar',
                    itemStyle: {
                        normal: {
                            color: function(params) {
                                var colorList = ['#5470c6', '#91cc75','#fac858','#ee6666','#73c0de','#3ba272','#fc8452','#9a60b4','#ea7ccc',];
                                var index=params.dataIndex%colorList.length;
                                return colorList[index]
                            }
                        }
                    },
                }],
            };
            option && myChart.setOption(option);


        },

xdata,ydata自造数组，color为滚动显示颜色组的颜色