地图api js版 多标注如何在地图上按照合适的缩放比例全部展示出来？ 请教了

var nt = new Array(); //标注点经纬信息 var marker = new Array(); //存放标注点对象 var info = new Array(); //存放提示信息窗口对象的数组 var searchInfoWindow =new Array();//存放检索信息窗口对象的数组 for (var i = 0; i < markerArr.length; i++) { var lng = markerArr[i].lng; var lat = markerArr[i].lat; nt[i] = new BMap.Point(lng, lat); marker[i] = new BMap.Marker(nt[i]); if(markerArr[i].parkEmptyCount >= 20 && markerArr[i].parkEmptyUpdateDate != null){ var icons = MAT_HOST + "/public/images/green.png"; //图片路径 var icon = new BMap.Icon(icons, new BMap.Size(24, 26),{ anchor: new BMap.Size(10, 25), infoWindowAnchor: new BMap.Size(10, 0) }); //显示图标大小 marker[i].setIcon(icon);//设置标签的图标为自定义图标 marker[i].disableMassClear(); map.addOverlay(marker[i]);//将标签添加到地图中去 } if(markerArr[i].parkEmptyCount > 0 && markerArr[i].parkEmptyCount < 20 && markerArr[i].parkEmptyUpdateDate != null){ var icons = MAT_HOST + "/public/images/orange.png"; var icon = new BMap.Icon(icons, new BMap.Size(24, 26),{ anchor: new BMap.Size(10, 25), infoWindowAnchor: new BMap.Size(10, 0) }); marker[i].setIcon(icon); marker[i].disableMassClear(); map.addOverlay(marker[i]); } if(markerArr[i].parkEmptyCount == 0 || markerArr[i].parkEmptyUpdateDate == null){ var icons = MAT_HOST + "/public/images/red.png"; var icon = new BMap.Icon(icons, new BMap.Size(24, 26),{ anchor: new BMap.Size(10, 25), infoWindowAnchor: new BMap.Size(10, 0) }); marker[i].setIcon(icon); marker[i].disableMassClear(); map.addOverlay(marker[i]); } var parkEmptyUpdateDate = markerArr[i].parkEmptyUpdateDate; parkEmptyUpdateDate = $.dateFormat({date:parkEmptyUpdateDate}); if(parkEmptyUpdateDate == ""){ markerArr[i].parkEmptyCount = "未知"; } info[i] = '<div style="padding:5px;font-size:12px;line-height:16px;">'; info[i] += ' <p style="padding:4px 0;">地址：'+markerArr[i].addr+'</p>'; info[i] += ' <p style="padding:4px 0;">空车位个数：' + markerArr[i].parkEmptyCount + '</p>'; if(parkEmptyUpdateDate != ""){ info[i] += ' <p style="padding:4px 0;">最后更新时间：' + parkEmptyUpdateDate; } info[i] += '</div>'; searchInfoWindow[i] = new BMapLib.SearchInfoWindow(map, info[i], { title: '<strong>'+markerArr[i].unitName+'</strong>', //标题 width:300, //宽度 panel:"panel", //检索结果面板 enableAutoPan : true, //自动平移 searchTypes:[ BMAPLIB_TAB_SEARCH, //周边检索 BMAPLIB_TAB_TO_HERE, //到这里去 BMAPLIB_TAB_FROM_HERE //从这里出发 ] }); //鼠标移上 marker[i].addEventListener("mouseover", (function(k){ return function(){ searchInfoWindow[k].open(marker[k]); //在marker上打开检索信息窗口 } })(i)); map.addEventListener("click", (function(k){ return function(){ searchInfoWindow[k].close(marker[k]); //在marker上打开检索信息窗口 } })(i)); }}循环打印就行了