A Google Map API trouble,ask for support - html

Question

I wrote a piece of code with Google Map to realize the location and GPS function.
But the navigation route always can't shows,I don't konw where is wrong?
Ask for help.Who can help me?
Thank you!
javascript code
<script type="text/javascript">
$( "#map-page" ).live( "pageinit", function() {
var directionsDisplay;
var directionsService = new google.maps.DirectionsService();
var map;
var salon = new google.maps.LatLng(22.981666,120.194301);
var defaultLatLng = new google.maps.LatLng(22.983587,120.22599); // Default to Hollywood, CA when no geolocation support
if ( navigator.geolocation ) {
function success(pos) {
// Location found, show map with these coordinates
drawMap(new google.maps.LatLng(pos.coords.latitude, pos.coords.longitude));
calcRoute(new google.maps.LatLng(pos.coords.latitude, pos.coords.longitude));
}
function fail(error) {
console.log(error);
drawMap(defaultLatLng); // Failed to find location, show default map
}
// Find the users current position. Cache the location for 5 minutes, timeout after 6 seconds
navigator.geolocation.getCurrentPosition(success, fail, {maximumAge: 500000, enableHighAccuracy:true, timeout: 6000});
} else {
drawMap(defaultLatLng); // No geolocation support, show default map
}
function drawMap(latlng) {
directionsDisplay = new google.maps.DirectionsRenderer();
var myOptions = {
zoom: 10,
center: latlng,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
map = new google.maps.Map(document.getElementById("map-canvas"), myOptions);
directionsDisplay.setMap(map);
// Add an overlay to the map of current lat/lng
var marker = new google.maps.Marker({
position: latlng,
map: map,
title: "Greetings!"
});
var marker = new google.maps.Marker({
position:new google.maps.LatLng(22.981666,120.194301),
map:map,
title:"the salon"
});
}
function calcRoute(latlng) {
var start = latlng;
var end = new google.maps.LatLng(22.981666,120.194301);
var request = {
origin:start,
destination:end,
travelMode: google.maps.TravelMode.DRIVING
};
directionsService.route(request, function(response, status) {
if (status == google.maps.DirectionsStatus.OK) {
directionsDisplay.setDirections(response);
}
});
}
});
</script>

Answer 1

i have worked out
this piece of code is wrong
if ( navigator.geolocation ) {
function success(pos) {
// Location found, show map with these coordinates
drawMap(new google.maps.LatLng(pos.coords.latitude, pos.coords.longitude));
calcRoute(new google.maps.LatLng(pos.coords.latitude, pos.coords.longitude));
}
function fail(error) {
console.log(error);
drawMap(defaultLatLng); // Failed to find location, show default map
}
// Find the users current position. Cache the location for 5 minutes, timeout after 6 seconds
navigator.geolocation.getCurrentPosition(success, fail, {maximumAge: 500000, enableHighAccuracy:true, timeout: 6000});
} else {
drawMap(defaultLatLng); // No geolocation support, show default map
}
i direct
// Location found, show map with these coordinates
drawMap(defaultLatLng);
calcRoute(defaultLatLng);