echarts中饼图或环形图的高亮效果(点击高亮/默认某一条高亮)

let chooseIndex = 0;//默认选中高亮模块索引 现在是默认第一条

that.myChart = echarts.init(document.getElementById(that.indexAll.id));
that.myChart.clear();
that.myChart.setOption(_option);

//默认第一条高亮
that.myChart.dispatchAction({type: 'highlight',seriesIndex: 0,dataIndex: 0});

that.myChart.off('click');  //取消echarts点击多次触发
that.myChart.on('click',function(e){
    // console.log(e)
  
    if(e.dataIndex != chooseIndex){
        //没用选中的取消高亮
        that.myChart.dispatchAction({type: 'downplay', seriesIndex: 0, dataIndex: chooseIndex});
    }
    //选中某一条高亮
    chooseIndex = e.dataIndex;
    that.myChart.dispatchAction({type: 'highlight',seriesIndex: 0,dataIndex: e.dataIndex});
});