用html5调取谷歌地图获取位置

function getmap(){
if(!navigator.geolocation) throw "Geolocation not supported";
var image=document.createElement("img");
navigator.geolocation.getCurrentPosition(setMapURL);
return image;
function setMapURL(){
var latitude=pos.coords.latitude;
var longitude=pos.coords.longitude;
var accuracy=pos.coords.accuracy;
var url="http://maps.google.com/map/api/staticmap"+"?center="+latitude+","+longitude+"&size=640*640&sensor=true";
var zoomlevel=20;
if(accuracy>80)
zoomlevel-=Math.round(Math.log(accuracy/50)/Math.LN2);
url+="&zoom="+zoomlevel;
image.src=url;
}
}
getmap();