js 地理定位但没有提示 - 可能吗?

Is it possible to get the geolocation of a user without the browser prompt?

这是来自 W3 的代码示例

<script>
   var x = document.getElementById("demo")

   function getLocation(){
     if(navigator.geolocation){
       navigator.geolocation.getCurrentPosition(showPosition);
     } else {
       x.innerHTML="Geolocation is not supported by this browser.";}
     }
     function showPosition(position){
       x.innerHTML="Latitude: " + position.coords.latitude + 
       "<br>Longitude: " + position.coords.longitude;   
     }
</script>

是否有类似 preventPrompt() 的功能?