echarts给整个地图添加外阴影

 废话不多说，附上核心代码，可以自己去echarts实例上修改编辑查看效果（https://www.echartsjs.com/examples/zh/index.html）：

        geo:{
            show: true,
            map: 'china',
            label: {
                normal: {
                    show: false
                },
                emphasis: {
                    show: false,
                }
        },

series: [
            {
                name: 'china PopEstimates',
                type: 'map',
                roam: true,
                map: 'china',
                
                // 文本位置修正
                textFixed: {
                    Alaska: [20, -20]
                }
               
            }
        ]