echart.js饼图显示文字

                    var chartDom = document.getElementById('leavechart');
                    var myChart = echarts.init(chartDom);
                    var option;
                    option = {
               
                        tooltip: {
                            trigger: 'item'
                        },
                        legend: {
                            orient: 'vertical',
                            left: 'top'
                        },
                        series: [
                            {
                                name: 'Access From',
                                type: 'pie',
                                radius: '50%',
                                data:obj,
                                emphasis: {
                                    itemStyle: {
                                        shadowBlur: 10,
                                        shadowOffsetX: 30,
                                        shadowColor: 'rgba(0, 0, 0, 0.5)'
                                    }
                                },
                                label: {
                                    normal: {
                                        show: true,
                                        position: 'inner',
                                        textStyle: {
                                            fontWeight: 300,
                                            fontSize:10
                                        },
                                        formatter: '{c}'
                                    }
                                }
                            }
                        ]
                    };

                    if (option && typeof option === 'object') {
                        myChart.setOption(option);
                    }

                    window.addEventListener('resize', myChart.resize);
                }