版本：9.0.0
获取地图中心

可获取当前展示地图的中心点经纬度坐标。
<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8" />
    <title>获取地图中心</title>
    <meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" />
    <style>
        body {
            margin: 0;
            padding: 0;
        }

        #map {
            position: absolute;
            top: 0;
            bottom: 0;
            width: 100%;
        }

        .btn-group {
            position: absolute;
            top: 20px;
            left: 20px;
        }

        #info{
            color:#ffffff;
            position:absolute;
            top:60px;
            left:20px;
        }
    </style>
    <script src="https://delivery.mapmost.com/cdn/sdk/webgl/v9.0.0/mapmost-webgl-min.js"></script>
</head>

<body>
    <div id="map"></div>
    <div class="btn-group">
        <button onClick="getMapCenter()">获取地图中心</button>
    </div>
    <div id="info">

    </div>
    <script>
        let map = new mapmost.Map({
            container: 'map',  
            style: "<your style url>", 
            center: [120.67400351817594, 31.321374251251726], 
            zoom: 13.310035105070947, 
            pitch: 59.48725112156901, 
            bearing: -54.10626584095007, 
            userId: '***', // 授权码
        });
        function getMapCenter() {
            let centerPoint = map.getCenter();
            document.getElementById('info').innerText =`经度:${centerPoint.lng}\n纬度:${centerPoint.lat}`
        }
    </script>
</body>

</html>