echarts 环形饼图 labelLine 线条消失

//源代码
let option = {
    
    
    title: {
    
    
        text: '单位：吨',
        right: 'right',
        textStyle: {
    
    
                fontSize: '14',
                fontWeight: 'normal'
              }
    },
    tooltip: {
    
    
        trigger: 'item',
        formatter: '{b} : {c}(吨)',
    },
    legend: {
    
    
        bottom: '5%',
        left: 'center'
    },
    series: [
        {
    
    
            type: 'pie',
            radius: ['40%', '70%'],
            //avoidLabelOverlap: false,//会导致线条重叠，删除
            //label: {
    
    
                //show: true,
                //position: 'center'
            //},           发现是label的影响到线条消失，删除即可
            emphasis: {
    
    
                label: {
    
    
                    show: false,
                    fontSize: '40',
                    fontWeight: 'bold'
                }
            },
           
            itemStyle:{
    
    
                        normal: {
    
    
                          color: function (params) {
    
    
                            var colorList = ['#ffc300','#ffeb3b', '#dea478','#ff8d1a','#d2ca3a','#fad55f']
                            return colorList[params.dataIndex]
                          }
                        }
                      },
            data: [
                {
    
    value: 111, name: '粮食'},
                {
    
    value: 222, name: '糖料'},
                {
    
    value: 333, name: '蔬菜'},
                {
    
    value: 444, name: '水果'},
                {
    
    value: 555, name: '水产品'},
                {
    
    value: 666, name: '肉类产量'}
            ]
        }
    ]
};