echarts pie 图表 显示的label 中内容 字体大小自定义

 option = {
     tooltip: {
         trigger: 'item',
         formatter: "{a} <br/>{b}: {c} ({d}%)"
     },
     legend: {
         orient: 'vertical',
         x: 'left',
         data:['直达','营销广告','搜索引擎','邮件营销','联盟广告','视频广告','百度','谷歌','必应','其他']
     },
     series: [
         {
             name:'访问来源',
             type:'pie',
             selectedMode: 'single',
             radius: [0, '30%'],

             label: {
                 normal: {
                     position: 'inner'
                 }
             },
             labelLine: {
                 normal: {
                     show: false
                 }
             },
             data:[
                 {value:335, name:'直达', selected:true},
                 {value:679, name:'营销广告'},
                 {value:1548, name:'搜索引擎'}
             ]
         },
         {
             name:'访问来源',
             type:'pie',
             radius: ['40%', '55%'],
             label: {
                 normal: {
                     formatter: '{a|{a}}{abg|}\n{hr|}\n  {b|{b}：}{c}  {per|{d}%}  ',  //label 的内容
                     backgroundColor: '#eee',
                     borderColor: '#aaa',
                     borderWidth: 1,
                     rich: {//定义不同地方的文字的字体大小和颜色
                         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:'直达'},
                 {value:310, name:'邮件营销'},
                 {value:234, name:'联盟广告'},
                 {value:135, name:'视频广告'},
                 {value:1048, name:'百度'},
                 {value:251, name:'谷歌'},
                 {value:147, name:'必应'},
                 {value:102, name:'其他'}
             ]
         }
     ]
 };

这是借助官网上的列子。