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1) Use geolocation:
Access the geolocation function through navigator.geolocation and return a Geolocation object ;
1.1) Geolocation object members:
getCurrentPosition(callback, errorCallback, options)——Get the current position;
watchPosition(callback,error,options)——Start monitoring the current position;
clearWatch(id)——Stop monitoring the current position;
1.1.1) The browser calls the callback function of getCurrentPosition Parameter , a position object providing location details will be passed in;
position object members:
coords——Returns the coordinates of the current location, that is, the Coordinates object;
##time stamp——Returns the time when coordinate information was obtained;
##Coordinates object members:
latitude——Returns the latitude expressed in decimal;
## longitude——Returns the longitude expressed in decimal;
## altitude——Returns the altitude expressed in meters;accuracy——Returns the coordinate accuracy expressed in meters;
altitudeAccuracy - Returns the altitude accuracy expressed in meters;
heading—— Returns the direction of travel expressed in degrees;
Speed——Returns the travel speed expressed in meters per second;2) Handling geolocation errors:
The second parameter of the getCurrentPosition(callback,errorCallback,options) method allows us to specify a function.
It is called when an error occurs while retrieving the position. This function will obtain a PositionError object; ##PositionError object members:
code——Returns the code representing the error type; ##
=1——The user is not authorized to use the geolocation function; #
=2——The location cannot be determined; ##
=3 - The attempt to request the location has timed out; ##
message——Returns a string describing the error; ##
##
##
enableHighAccuracy - tells the browser that we want to get the best possible results;
timeout——Event that limits the request location. After setting the number of milliseconds, a timeout error will be reported; ##
maximumAge - tells the browser that we are willing to accept a cached location as long as it is no older than the specified number of milliseconds; 4) Monitoring location:
The watchPosition method continuously gets updates about the position. The required parameters are the same as the getCurrentPosition method and works the same way. ##
The difference is: as the position changes, the callback function will be called repeatedly. table{
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var options={
enableHighAccuracy:false,
timeout:2000,
maximumAge:30000
}
var WatchID=navigator.geolocation.watchPosition(displayPosition,handleError,options)
document.getElementById("pressme").onclick=function(e){
navigator.geolocation.clearWatch(WatchID);
}
function displayPosition(pos){
var properties=["longitude","latitude","altitude","accuracy","altitudeAccuracy","heading","speed"];
for(var i=0;i
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