<!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>HTML5定位功能，实现在百度地图上定位
原文地址：http://www.cnblogs.com/dongh/p/7922024.html