圆环渐变色echarts 饼配置项内容和展示

      app.title = '环形图';
const itemColor= {
                        type: 'linear',
                        x: 0,
                        y: 0,
                        x2: 0,
                        y2: 1,
                        colorStops: [{
                            offset: 0,
                            color: 'red' // 0% 处的颜色
                        }, {
                            offset: 1,
                            color: 'blue' // 100% 处的颜色
                        }],
                        globalCoord: false // 缺省为 false
                    };
option = {
    tooltip: {
        trigger: 'item',
        formatter: "{a} <br/>{b}: {c} ({d}%)"
    },
    legend: {
        orient: 'vertical',
        x: 'left',
        data:['直接访问','邮件营销','联盟广告','视频广告','搜索引擎']
    },
    series: [
        {
            name:'访问来源',
            type:'pie',
            radius: ['50%', '70%'],
            avoidLabelOverlap: false,
            label: {
                normal: {
                    show: false,
                    position: 'center'
                },
                emphasis: {
                    show: true,
                    textStyle: {
                        fontSize: '30',
                        fontWeight: 'bold'
                    }
                }
            },
            labelLine: {
                normal: {
                    show: false
                }
            },
            data:[
                {value:335, name:'直接访问', itemStyle: {
                normal: {
                    color:itemColor
                },
                emphasis: {
                    color:itemColor
                }
            }},
                {value:310, name:'邮件营销',itemStyle: {
                normal: {
                    color: {
                        type: 'linear',
                        x: 0,
                        y: 0,
                        x2: 0,
                        y2: 1,
                        colorStops: [{
                            offset: 0,
                            color: '#f80000' // 0% 处的颜色
                        }, {
                            offset: 1,
                            color: '#00ffff' // 100% 处的颜色
                        }],
                        globalCoord: false // 缺省为 false
                    },
                    shadowColor: 'rgba(0, 0, 0, 0.2)',
                    shadowBlur: 10
                }
            }},
                {value:234, name:'联盟广告'},
                {value:135, name:'视频广告'},
                {value:1548, name:'搜索引擎'}
            ]
        }
    ]
};