百度地图InfoWindow弹窗圆角

效果如下

使用CSS样式

        /*地图标题*/

        .BMap_pop div:nth-child(1) div {
            border-radius: 8px 0 0 0;
        }

        .BMap_pop div:nth-child(3) {
            border-radius: 0 9px 0 0;
            border-top: 1px solid #ababab;
            border-right: 1px solid #ababab;
            border-left: 1px solid white;
            width: 23px !important;
            height: 24px !important;
            background-color: white;
        }

        .BMap_pop div:nth-child(3) div {
            display: none;
        }

        .BMap_pop div:nth-child(5) div {
            border-radius: 0 0 0 8px;
        }

        .BMap_pop div:nth-child(7) {
            border-radius: 0 0 9px 0;
            border-right: 1px solid #ababab;
            border-bottom: 1px solid #ababab;
            border-left: 1px solid white;
            width: 23px !important;
            height: 24px !important;
            background-color: white;
        }

        .BMap_pop div:nth-child(7) div {
            display: none;
        }

注意事项

　　经本人测试，在win10 系统下，兼容谷歌/360极速/IE11/火狐 浏览器。