echarts 饼图legend点击不置灰

echart默认点击legend时候，当前点击的legend会置灰，有两种方式不置灰

1.设置selectedMode: false,这种方法控制不能点击legend

legend: {

                orient: 'vertical',

                x:'center',

                y:'center',

                textStyle:{fontSize:14},

                icon:'circle',

                //这两个属性设置图例前面图标大小的

                itemWidth:8,

                itemHeight:8,

                selectedMode: false,

                data:[{name:'男'},{name:'女'}]

            }

2.在legendselectchanged事件里面设置，这种方法可以控制点击legend时候处理其他业务

this.$khflChart.on('legendselectchanged', (params:any) => {

            that.$khflChart.setOption({

                legend:{selected:{[params.name]: true}}

            });

        });

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