高德地图 JS API示例-覆盖物- › 通用- › 获取某个覆盖物

<!doctype html>
<html>
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no, width=device-width">
    <title>获取某个覆盖物</title>
    <link rel="stylesheet" href="https://a.amap.com/jsapi_demos/static/demo-center/css/demo-center.css"/>
    <style>
        html, body, #container {
            height: 100%;
            width: 100%;
        }
    </style>
</head>
<body>
<div id="container"></div>
<div class="input-card">
    <input id="getAllOverlays" type="button" class="btn" value="获取 id 为 2 覆盖物"/>
</div>
<script type="text/javascript"
        src="https://webapi.amap.com/maps?v=1.4.15&key=您申请的key值"></script>
<script type="text/javascript">
    // 创建地图实例
    var map = new AMap.Map("container", {
        zoom: 13,
        center: [116.43, 39.92],
        resizeEnable: true
    });

    var lnglats = [[116.39, 39.92], [116.41, 39.93], [116.43, 39.91], [116.46, 39.93]];
    var markers = [];

    for (var i = 0; i < lnglats.length; i++) {
        var lnglat = lnglats[i];
        // 创建点实例
        var marker = new AMap.Marker({
            position: new AMap.LngLat(lnglat[0], lnglat[1]),
            icon: 'https://webapi.amap.com/theme/v1.3/markers/n/mark_b'+(i+1)+'.png',
            extData:{
                id: i + 1
            }
        });

        markers.push(marker);
    }

    // 将点添加到地图
    map.add(markers);

    // 获取当前 id 的覆盖物
    function getOneOverlay() {
        var targetId = 2;
        var targetMarker;

        for(var i = 0; i < markers.length; i++){
            // 获取存在每个 extData 中的 id
            var id = markers[i].getExtData().id;

            if(id === targetId){
                targetMarker = markers[i];
                break;
            }
        }

        var position = targetMarker.getPosition();

        var infoWindow = new AMap.InfoWindow({
            position: position,
            offset: new AMap.Pixel(0, -35),
            content: '<div>已获取 id 为 2 覆盖物</div>'
        });

        infoWindow.open(map);
    }

    // 绑定获取覆盖物事件
    document.getElementById("getAllOverlays").onclick = getOneOverlay;
</script>
</body>
</html>

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