利用HTML5定位功能，实现在百度地图上（亲测很成功，）

本文介绍了一种利用HTML5的地理位置API结合百度地图API实现网页中用户位置定位的方法。通过检测浏览器对GeoLocation的支持情况，并获取用户的经纬度坐标，在百度地图上显示出来。
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转自：http://6087379.blog.51cto.com/6077379/1437410
定位
代码如下：
<!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);

                          }); 

                      }                    

                  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>