利用百度地图API获取当前位置信息的实例

<script type="text/javascript"> var map; var gpsPoint; var baiduPoint; var gpsAddress; var baiduAddress; var x;var y;function getLocation() { //根据IP获取城市 var myCity = new BMap.LocalCity(); myCity.get(getCityByIP); //获取GPS坐标 if (navigator.geolocation) { navigator.geolocation.getCurrentPosition(showMap, handleError, { enableHighAccuracy: true, maximumAge: 1000 }); } else { alert("您的浏览器不支持使用HTML 5来获取地理位置服务"); } } function showMap(value) { var longitude = value.coords.longitude; var latitude = value.coords.latitude; map = new BMap.Map("map"); x=latitude;y=longitude;//alert("坐标经度为：" + latitude + "， 纬度为：" + longitude ); gpsPoint = new BMap.Point(longitude, latitude); // 创建点坐标 //根据坐标逆解析地址 var geoc = new BMap.Geocoder(); geoc.getLocation(gpsPoint, getCityByCoordinate); BMap.Convertor.translate(gpsPoint, 0, translateCallback); map.enableScrollWheelZoom(true);} translateCallback = function (point) { baiduPoint = point; map.centerAndZoom(baiduPoint, 18); var geoc = new BMap.Geocoder(); geoc.getLocation(baiduPoint, getCityByBaiduCoordinate); } function getCityByCoordinate(rs) { gpsAddress = rs.addressComponents; var address = "GPS标注：" + gpsAddress.province + "," + gpsAddress.city + "," + gpsAddress.district + "," + gpsAddress.street + "," + gpsAddress.streetNumber; var marker = new BMap.Marker(gpsPoint); // 创建标注 map.addOverlay(marker); // 将标注添加到地图中 var labelgps = new BMap.Label(address, { offset: new BMap.Size(20, -10) }); marker.setLabel(labelgps); //添加GPS标注 } function getCityByBaiduCoordinate(rs) { baiduAddress = rs.addressComponents; var address = "百度标注：" + baiduAddress.province + "," + baiduAddress.city + "," + baiduAddress.district + "," + baiduAddress.street + "," + baiduAddress.streetNumber; var marker = new BMap.Marker(baiduPoint); // 创建标注 map.addOverlay(marker); // 将标注添加到地图中 var labelbaidu = new BMap.Label(address, { offset: new BMap.Size(20, -10) }); marker.setLabel(labelbaidu); //添加百度标注 } //根据IP获取城市 function getCityByIP(rs) { var cityName = rs.name; alert("根据IP定位您所在的城市为:" + cityName); } function handleError(value) { switch (value.code) { case 1: alert("位置服务被拒绝"); break; case 2: alert("暂时获取不到位置信息"); break; case 3: alert("获取信息超时"); break; case 4: alert("未知错误"); break; } } function init() { getLocation(); } window.onload = init; </script>