echarts常用方法，legend状态支持两张图片切换（四）

//图例事件
  let lgdt = this._ledgend(),
      lgData = lgdt.legendData,lgList = lgdt.legendList,
      imgs = this._icon(),imglg = imgs.length,unIng = this._lgiconUnActive(),
      iconUnActive = `image://${unIng}`;
      myChart.on(‘legendselectchanged‘, (params)=>{
            let {selected,name} = params,i = lgList.indexOf(name);
            let theOption = lgData.find(dt => dt.name === name);
         
            let iconActive = `image://${imgs[i%imglg]}`;
            theOption.icon = selected[name] ? iconActive : iconUnActive;
            // 更新图列
            this.$chart.setOption({
                legend: { data: lgData }
            })
       })