高德地圖1.點聚合 2.放大到最大級別后沒辦法繼續顯示（點距離過近，或是同一個經緯度）

1.引用
<script type="text/javascript" src="https://webapi.amap.com/maps?v=1.4.15&key=你申請的key&plugin=AMap.MouseTool,AMap.MarkerClusterer"></script>


2.使用

window.showAllPoint = function(allMarkers) {
        overlayGroups = []; //清空覆蓋物群組集合
        markers = []; //清空點的集合
        polyline = null; //清空線標記
        polyGon = null; //清空面標記
        for(var i = 0; i < allMarkers.length; i++) {
            var point = eval(allMarkers[i].lnglat);
            var radius = parseFloat(allMarkers[i].radius); //圓半徑 
            //如果是點標記
            if(allMarkers[i].types == 1) {
                //創建點實例
                marker = new AMap.Marker({
                    position: new AMap.LngLat(point[0], point[1]),
                    title: allMarkers[i].name,
                    map: map,
                    icon: allMarkers[i].icon
                });
                if(nowpage == 'gdiframe')
                    marker.content = setInfoContent(allMarkers[i]);
                marker.on('click', markerClick);

                markers.push(marker);
                // 創建覆蓋物群組，並將 marker 傳給 OverlayGroup
                //overlayGroups = new AMap.OverlayGroup(markers);
                // 添加覆蓋物群組
                //map.add(overlayGroups);
                
            }
            //如果是線標記 
            else if(allMarkers[i].types == 2) {
                //創建線實例
                polyline = new AMap.Polyline({
                    path: point,
                    strokeColor: allMarkers[i].color || allMarkers[i].backgrse || "red",
                    strokeOpacity: 1,
                    strokeWeight: 2,
                    strokeStyle: 'solid',
                    strokeDasharray: [10, 5],
                    geodesic: true
                });
                polyline.setMap(map);
                if(nowpage == 'gdiframe')
                    polyline.content = setInfoContent(allMarkers[i]);
                polyline.on('click', lineOrFaceClick);

            }

            //如果是面/矩形標記
            else if(allMarkers[i].types == 3 || (allMarkers[i].types == 4)) {
                //創建面實例
                polyGon = new AMap.Polygon({
                    path: point,
                    map: map,
                    strokeColor: allMarkers[i].color || allMarkers[i].backgrse || "red",
                    strokeOpacity: 1,
                    strokeWeight: 2,
                    strokeStyle: 'solid',
                    strokeDasharray: [10, 5],
                    fillColor: allMarkers[i].color || allMarkers[i].backgrse || "red",
                    fillOpacity: 0.2,
                    geodesic: true
                })
                if(nowpage == 'gdiframe')
                    polyGon.content = setInfoContent(allMarkers[i]);
                polyGon.on('click', lineOrFaceClick);
            }
            //如果是圓形標記
            else if(allMarkers[i].types == 5) {
                //創建圓實例
                polyGon = new AMap.Circle({
                    center: point,
                    radius: radius,
                    map: map,
                    strokeColor: allMarkers[i].color || allMarkers[i].backgrse || "red",
                    strokeOpacity: 1,
                    strokeWeight: 2,
                    strokeStyle: 'solid',
                    strokeDasharray: [10, 5],
                    fillColor: allMarkers[i].color || allMarkers[i].backgrse || "red",
                    fillOpacity: 0.2,
                    geodesic: true
                })
                if(nowpage == 'gdiframe')
                    polyGon.content = setInfoContent(allMarkers[i]);
                polyGon.on('click', lineOrFaceClick);
            }
            
        }
        cluster = new AMap.MarkerClusterer(map, markers, {gridSize: 80});//點聚合
　　　　

// 獲取地圖的縮放級別，如果級別已經是最高，那么點擊后，顯示聚合點內的點信息
cluster.on('click',function(e,markers){
if(map.getZoom() == 18){
var itemsContent = "";
e.markers.forEach(function (item, index) {
itemsContent += item.content;
// console.log(itemsContent);
});
e.markers.forEach(function (item, index) {
infoWindow.setContent(itemsContent);
infoWindow.open(map, item.getPosition());
});
}

})

        map.setFitView(); 
    }