版本号
"echarts":"^4.2.0-rc.2",

代码：
/* 饼图*/
drawPi() {
// 基于准备好的dom，初始化echarts实例
var myChart = echarts.init(document.getElementById("ChartPi"));

  // 绘制图表
  var option = {
    title: {
      text: "同名数量统计",
      subtext: "纯属虚构",
      x: "center"
    },
    tooltip: {
      trigger: "item",
      formatter: "{a} <br/>{b} : {c} ({d}%)"
    },
    legend:{
        orient: 'vertical',
        left: 'left',
        show: true,
        data: [{name:"直接访问"}, {name:"邮件营销"}, {name:"联盟广告"}, {name:"视频广告"}, {name:"搜索引擎"}]
    },
    series: [
      {
        name: "直接访问",
        type: "pie",
        radius: ["40%", "70%"],
        // avoidLabelOverlap: true,
        hoverAnimation: true,
        selectedOffset: 1,
        cursor: "pointer",
        animationDuration: 1000,
        animation: true,
        label: {
          normal: {
            show: false,
            position: "inside"
          },
          emphasis: {
            show: true,
            textStyle: {
              fontSize: "14",
              fontWeight: "bold"
            }
          }
        },
        labelLine: {
          normal: {
            show: false
          }
        },
        data: [
          { value: 335, name: "直接访问" },
          { value: 310, name: "邮件营销" },
          { value: 234, name: "联盟广告" },
          { value: 135, name: "视频广告" },
          { value: 1548, name: "搜索引擎" }
        ]
      }
    ]
  };
  myChart.setOption(option, true);
},