利用HTML5定位功能，实现在百度地图上定位

2015/11/24 40841
<!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>
代码片段
