html5打开页面直接取纬度,html5获取不了经度和纬度

点击这个按钮，获得您的位置：

试一下

var x=document.getElementById("demo");

function getLocation()

{

if (navigator.geolocation)

{

navigator.geolocation.getCurrentPosition(showPosition,showError);

}

else{x.innerHTML="Geolocation is not supported by this browser.";}

}

function showPosition(position)

{

lat=position.coords.latitude;

lon=position.coords.longitude;

latlon=new google.maps.LatLng(lat, lon)

mapholder=document.getElementById('mapholder')

mapholder.style.height='250px';

mapholder.style.width='500px';

var myOptions={

center:latlon,zoom:14,

mapTypeId:google.maps.MapTypeId.ROADMAP,

mapTypeControl:false,

navigationControlOptions:{style:google.maps.NavigationControlStyle.SMALL}

};

var map=new google.maps.Map(document.getElementById("mapholder"),myOptions);

var marker=new google.maps.Marker({position:latlon,map:map,title:"You are here!"});

}

function showError(error)

{

switch(error.code)

{

case error.PERMISSION_DENIED:

x.innerHTML="User denied the request for Geolocation."

break;

case error.POSITION_UNAVAILABLE:

x.innerHTML="Location information is unavailable."

break;

case error.TIMEOUT:

x.innerHTML="The request to get user location timed out."

break;

case error.UNKNOWN_ERROR:

x.innerHTML="An unknown error occurred."

break;

}

}

不知道为什么一直获取不了经度和纬度   是代码问题还是本来就获取不了