只接收特定格式的数组对象，所以要转化
注意初始化和清除

<div id="eventData" ></div>
        
        drawPie(id) {
            this.charts = echarts.init(document.getElementById(id))
            this.charts.setOption({
                color: ['#ccc','#1890ff','#52c41a','#f5222d'],    //自定义颜色
                series: [
                    {
                        name: '访问来源',
                        type: 'pie',
                        radius: ['40%', '60%'],           //内径外径
                        label: {
                            normal: {
                                show: false
                            },
                            emphasis: {
                                show: true,
                                formatter: '{c}',
                            }
                        },
                        lableLine: {
                            normal: {
                                show: false
                            },
                            emphasis: {
                                show: true,
                            }
                        },
                        data:this.chartData[id]
                    }
                ]
            })
        },