第一种方式
option下

color:['#45C2E0', '#C1EBDD', '#FFC851','#5A5476','#1869A0','#FF9393'],

整体代码如下：

option = {
    tooltip: {
        trigger: 'item'
    },
    legend: {
        top: '5%',
        left: 'center'
    },
    color:['#45C2E0', '#C1EBDD', '#FFC851','#5A5476','#1869A0','#FF9393'],
    series: [
        {
            name: '城市',
            type: 'pie',
            radius: ['50%', '70%'],
            avoidLabelOverlap: false,
            label: {
                show: false,
                position: 'center'
            },
            emphasis: {
                label: {
                    show: true,
                    fontSize: '40',
                    fontWeight: 'bold'
                }
            },
            labelLine: {
                show: false
            },
            data: [
                {value: 1048, name: '北京'},
                {value: 735, name: '上海'},
                {value: 580, name: '广州'},
                {value: 484, name: '深圳'},
                {value: 300, name: '杭州'},
                {value:456,name:"雄安"}
            ]
        }
    ]
};

效果如下：

第二种方式
series下

itemStyle: {
                          normal: {
                              color: function(colors) {
            var colorList = [
            '#45C2E0', '#C1EBDD', '#FFC851','#5A5476','#1869A0','#FF9393'
            ];
            return colorList[colors.dataIndex]
        }
    }
},

整体代码如下：

option = {
    backgroundColor: '#2c343c',

    title: {
        text: 'Customized Pie',
        left: 'center',
        top: 20,
        textStyle: {
            color: '#ccc'
        }
    },

    tooltip: {
        trigger: 'item'
    },

    visualMap: {
        show: false,
        min: 80,
        max: 600,
        inRange: {
            colorLightness: [0, 1]
        }
    },
    series: [
        {
            name: '访问来源',
            type: 'pie',
            radius: '55%',
            center: ['50%', '50%'],
            data: [
                {value: 335, name: '直接访问'},
                {value: 310, name: '邮件营销'},
                {value: 274, name: '联盟广告'},
                {value: 235, name: '视频广告'},
                {value: 400, name: '搜索引擎'}
            ].sort(function (a, b) { return a.value - b.value; }),
            roseType: 'radius',
            label: {
                color: 'rgba(255, 255, 255, 0.3)'
            },
            labelLine: {
                lineStyle: {
                    color: 'rgba(255, 255, 255, 0.3)'
                },
                smooth: 0.2,
                length: 10,
                length2: 20
            },
            itemStyle: {
                normal: {
                              color: function(colors) {
            var colorList = [
            '#45C2E0', '#C1EBDD', '#FFC851','#5A5476','#1869A0','#FF9393'
            ];
            return colorList[colors.dataIndex]
        }},
                shadowBlur: 200,
                shadowColor: 'rgba(0, 0, 0, 0.5)'
            },

            animationType: 'scale',
            animationEasing: 'elasticOut',
            animationDelay: function (idx) {
                return Math.random() * 200;
            }
        }
    ]
};

效果如下：

第三种方式
data下

itemStyle: {color:"black"}

整体代码如下：

option = {
    title: {
        text: '某站点用户访问来源',
        subtext: '纯属虚构',
        left: 'center'
    },
    tooltip: {
        trigger: 'item'
    },
    legend: {
        orient: 'vertical',
        left: 'left',
    },
    series: [
        {
            name: '访问来源',
            type: 'pie',
            radius: '50%',
            data: [
                {value: 1048, name: '搜索引擎',itemStyle: {color:"black"}},
                {value: 735, name: '直接访问'},
                {value: 580, name: '邮件营销'},
                {value: 484, name: '联盟广告'},
                {value: 300, name: '视频广告'}
            ],
            emphasis: {
                itemStyle: {
                    shadowBlur: 10,
                    shadowOffsetX: 0,
                    shadowColor: 'rgba(0, 0, 0, 0.5)'
                }
            }
        }
    ]
};

效果如下：