echarts pie 圖表 顯示的label 中內容 字體大小自定義

option = {
    tooltip: {
        trigger: 'item',
        formatter: "{a} <br/>{b}: {c} ({d}%)"
    },
    legend: {
        orient: 'vertical',
        x: 'left',
        data:['直達','營銷廣告','搜索引擎','郵件營銷','聯盟廣告','視頻廣告','百度','谷歌','必應','其他']
    },
    series: [
        {
            name:'訪問來源',
            type:'pie',
            selectedMode: 'single',
            radius: [0, '30%'],

            label: {
                normal: {
                    position: 'inner'
                }
            },
            labelLine: {
                normal: {
                    show: false
                }
            },
            data:[
                {value:335, name:'直達', selected:true},
                {value:679, name:'營銷廣告'},
                {value:1548, name:'搜索引擎'}
            ]
        },
        {
            name:'訪問來源',
            type:'pie',
            radius: ['40%', '55%'],
            label: {
                normal: {
                    formatter: '{a|{a}}{abg|}\n{hr|}\n  {b|{b}：}{c}  {per|{d}%}  ',  //label 的內容
                    backgroundColor: '#eee',
                    borderColor: '#aaa',
                    borderWidth: 1,
                    rich: {//定義不同地方的文字的字體大小和顏色
                        a: {
                            color: '#999',
                            lineHeight: 22,
                            align: 'center'
                        },
                        hr: {
                            borderColor: '#aaa',
                            width: '100%',
                            borderWidth: 0.5,
                            height: 0
                        },
                        b: {
                            fontSize: 16,
                            lineHeight: 33
                        },
                        per: {
                            color: '#eee',
                            backgroundColor: '#334455',
                            padding: [2, 4],
                            borderRadius: 2
                        }
                    }
                }
            },
            data:[
                {value:335, name:'直達'},
                {value:310, name:'郵件營銷'},
                {value:234, name:'聯盟廣告'},
                {value:135, name:'視頻廣告'},
                {value:1048, name:'百度'},
                {value:251, name:'谷歌'},
                {value:147, name:'必應'},
                {value:102, name:'其他'}
            ]
        }
    ]
};

這是借助官網上的列子。