function getLocation(){ 
  if (navigator.geolocation){ 
    navigator.geolocation.getCurrentPosition(showPosition,showError); 
  }else{ 
    alert("浏览器不支持地理定位。"); 
  } 
} 

function showError(error){ 
  switch(error.code) { 
    case error.PERMISSION_DENIED: 
      alert("定位失败,用户拒绝请求地理定位"); 
      break; 
    case error.POSITION_UNAVAILABLE: 
      alert("定位失败,位置信息是不可用"); 
      break; 
    case error.TIMEOUT: 
      alert("定位失败,请求获取用户位置超时"); 
      break; 
    case error.UNKNOWN_ERROR: 
      alert("定位失败,定位系统失效"); 
      break; 
  } 
} 

function showPosition(position){ 
  var lat = position.coords.latitude; //纬度 
  var lag = position.coords.longitude; //经度 
  alert('纬度:'+lat+',经度:'+lag); 
} 

 
function showPosition(position){ 
  var latlon = position.coords.latitude+','+position.coords.longitude; 
   
  //baidu 
  var url = "http://api.map.baidu.com/geocoder/v2/?ak=C93b5178d7a8ebdb830b9b557abce78b&callback=renderReverse&location="+latlon+"&output=json&pois=0"; 
  $.ajax({ 
    type: "GET", 
    dataType: "jsonp", 
    url: url, 
    beforeSend: function(){ 
      $("#baidu_geo").html('正在定位...'); 
    }, 
    success: function (json) { 
      if(json.status==0){ 
        $("#baidu_geo").html(json.result.formatted_address); 
      } 
    }, 
    error: function (XMLHttpRequest, textStatus, errorThrown) { 
      $("#baidu_geo").html(latlon+"地址位置获取失败"); 
    } 
  }); 
}); 

function showPosition(position){ 
  var latlon = position.coords.latitude+','+position.coords.longitude; 
 
  //google 
  var url = 'http://maps.google.cn/maps/api/geocode/json?latlng='+latlon+'&language=CN'; 
  $.ajax({ 
    type: "GET", 
    url: url, 
    beforeSend: function(){ 
      $("#google_geo").html('正在定位...'); 
    }, 
    success: function (json) { 
      if(json.status=='OK'){ 
        var results = json.results; 
        $.each(results,function(index,array){ 
          if(index==0){ 
          $("#google_geo").html(array['formatted_address']); 
          } 
        }); 
      } 
    }, 
    error: function (XMLHttpRequest, textStatus, errorThrown) { 
      $("#google_geo").html(latlon+"地址位置获取失败"); 
    } 
  }); 
}