利用HTML5定位功能，实现在百度地图上定位（转）
代码如下：
测试浏览器：ie11定位成功率100%，Safari定位成功率97%，（add by zhj :在手机上测试（用微信内置浏览器打开），无论使用WIFI还是移动4G联网，
定位精度都是蛮高的，误差在几十米内）
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>HTML5定位</title> <script type="text/javascript" src="http://lib.sinaapp.com/js/jquery/1.7.2/jquery.min.js"></script> <script type="text/javascript" src="http://api.map.baidu.com/api?v=2.0&ak=wqBXfIN3HkpM1AHKWujjCdsi"></script> <script type="text/javascript" src="http://developer.baidu.com/map/jsdemo/demo/convertor.js"></script> <style type="text/css"> *{ margin: 0px; padding: 0px;} body{text-align: center; height: 100%;overflow:hidden;} #allmap{ width: 100%;height: 100%; position: absolute;} </style> </head> <body> <div id="allmap"></div> <script type="text/javascript"> $(function(){ if(supportsGeoLocation()){ alert("你的浏览器支持 GeoLocation."); }else{ alert("不支持 GeoLocation.") } // 检测浏览器是否支持HTML5 function supportsGeoLocation(){ return !!navigator.geolocation; } // 单次位置请求执行的函数 function getLocation(){ navigator.geolocation.getCurrentPosition(mapIt,locationError); } //定位成功时，执行的函数 function mapIt(position){ var lon = position.coords.longitude; var lat = position.coords.latitude; // alert("您位置的经度是："+lon+" 纬度是："+lat); var map = new BMap.Map("allmap"); var point = new BMap.Point(""+lon+"",""+lat+""); map.centerAndZoom(point,19); var gc = new BMap.Geocoder(); translateCallback = function (point){ var marker = new BMap.Marker(point); map.addOverlay(marker); map.setCenter(point); gc.getLocation(point, function(rs){ var addComp = rs.addressComponents; if(addComp.province!==addComp.city){ var sContent = "<div><h4 style='margin:0 0 5px 0;padding:0.2em 0'>你当前的位置是：</h4>" + "<p style='margin:0;line-height:1.5;font-size:13px;text-indent:2em'>"+addComp.province + ", " + addComp.city + ", " + addComp.district + ", " + addComp.street + ", " + addComp.streetNumber+"</p>" + "</div>";
} else{ var sContent = "<div><h4 style='margin:0 0 5px 0;padding:0.2em 0'>你当前的位置是：</h4>" + "<p style='margin:0;line-height:1.5;font-size:13px;text-indent:2em'>"+ addComp.city + ", " + addComp.district + ", " + addComp.street + ", " + addComp.streetNumber+"</p>" + "</div>"; } var infoWindow = new BMap.InfoWindow(sContent); map.openInfoWindow(infoWindow,point); }); }
//gpsPoint：转换前坐标，第二个参数为转换方法，0表示gps坐标转换成百度坐标，callback回调函数，参数为新坐标点 BMap.Convertor.translate(point,0,translateCallback); } // 定位失败时，执行的函数 function locationError(error) { switch(error.code) { case error.PERMISSION_DENIED: alert("User denied the request for Geolocation."); break; case error.POSITION_UNAVAILABLE: alert("Location information is unavailable."); break; case error.TIMEOUT: alert("The request to get user location timed out."); break; case error.UNKNOWN_ERROR: alert("An unknown error occurred."); break; } } // 页面加载时执行getLocation函数 window.onload = getLocation; }) </script> </body> </html>
