var location = window.navigator.geolocation;
var options = {
enableHighAccuracy: true,
timeout: 60000,
maximumAge: 600000
}
this.position = location.getCurrentPosition(this.locationSuccess.bind(this),this.locationFail.bind(this),options);
http://www.w3.org/TR/2010/CR-geolocation-API-20100907/