echarts地图阴影会在区域块内部显现出来怎么解决？-灵析社区

如图，我想用shadow构造一个立体效果，不希望它在右上方有绿色线条。我尝试修改透明度，但并没有用。  代码如下，这是一个[官网示例](https://link.segmentfault.com/?enc=opzmj0LLpl2lO10PqCj6mQ%3D%3D.bBSSOx8Aj3XgLVhmR4%2BDL6IrFz5R%2B%2FF%2F0t9%2FG%2B4TIRBmDtjrtK6hu4NdOU9zIR2TYO5WhLvW1zhIyjKfysOF0Q%3D%3D) myChart.showLoading(); $.get(ROOT_PATH + '/data/asset/geo/USA.json', function (usaJson) { myChart.hideLoading(); echarts.registerMap('USA', usaJson, { Alaska: { left: -131, top: 25, width: 15 }, Hawaii: { left: -110, top: 28, width: 5 }, 'Puerto Rico': { left: -76, top: 26, width: 2 } }); option = { geo: { map: 'USA', show: true, itemStyle: { }, regions: [ { name: 'New Mexico', itemStyle: { areaColor: '#eee', shadowBlur: 2, shadowColor: 'green', shadowOffsetY: 15, shadowOffsetX: -15, opacity: 1 } } ] }, }; myChart.setOption(option); });