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我正在使用Google Maps API，使用JavaScript/HTML。我試圖添加簡單的按鈕。如果用戶按下這些按鈕，它會在地圖上左轉，右轉等。但是，我的函數changeHeading被調用，但在調用之後不會執行。問題是什麼？Google Maps API - 添加簡單的按鈕以向左轉，向右轉等
<head>
<meta charset="utf-8">
<title>Street View Add Third Panel</title>
<style>
html, body {
height: 100%;
margin: 0;
padding: 0;
}
#map {
float: left;
height: 50%;
width: 50%;
}
#pano {
width: 100%;
height: 50%;
}
#floating-panel {
float: right;
width: 50%;
height: 50%;
}
</style>
</head>
<body>
<div id="map"></div>
<div id="floating-panel">
<table>
<tr>
<td><b>Position</b></td><td id="position-cell"> </td>
</tr>
<tr>
<td><b>POV Heading</b></td><td id="heading-cell">270</td>
</tr>
<tr>
<td><b>POV Pitch</b></td><td id="pitch-cell">0.0</td>
</tr>
<tr>
<td><b>Pano ID</b></td><td id="pano-cell"> </td>
</tr>
<tr>
<input type="button" value="Turn Left" onclick="changeHeading(-5);">
</tr>
<tr>
<input type="button" value="Turn Right" onclick="changeHeading(-5);">
</tr>
<tr>
<input type="button" value="Go Forward" onclick="changeHeading(-5);">
</tr>
<tr>
<input type="button" value="Go Backward" onclick="changeHeading(-5);">
</tr>
<table id="links_table"></table>
</table></div>
<div id="pano"></div>
<script>
function initialize() {
var fenway = {lat: 42.345573, lng: -71.098326};
var map = new google.maps.Map(document.getElementById('map'), {
center: fenway,
zoom: 14
});
var panorama = new google.maps.StreetViewPanorama(
document.getElementById('pano'), {
position: fenway,
pov: {
heading: 34,
pitch: 10
}
});
map.setStreetView(panorama);
panorama.addListener('pano_changed', function() {
var panoCell = document.getElementById('pano-cell');
panoCell.innerHTML = panorama.getPano();
});
panorama.addListener('links_changed', function() {
var linksTable = document.getElementById('links_table');
while (linksTable.hasChildNodes()) {
linksTable.removeChild(linksTable.lastChild);
}
var links = panorama.getLinks();
for (var i in links) {
var row = document.createElement('tr');
linksTable.appendChild(row);
var labelCell = document.createElement('td');
labelCell.innerHTML = '<b>Link: ' + i + '</b>';
var valueCell = document.createElement('td');
valueCell.innerHTML = links[i].description;
linksTable.appendChild(labelCell);
linksTable.appendChild(valueCell);
}
});
panorama.addListener('position_changed', function() {
var positionCell = document.getElementById('position-cell');
positionCell.firstChild.nodeValue = panorama.getPosition() + '';
});
panorama.addListener('pov_changed', function() {
var headingCell = document.getElementById('heading-cell');
var pitchCell = document.getElementById('pitch-cell');
headingCell.firstChild.nodeValue = panorama.getPov().heading + '';
pitchCell.firstChild.nodeValue = panorama.getPov().pitch + '';
});
}
function changeHeading(delta) {
heading = panorama.getPov().heading;
panorama.setPov({ heading: heading + delta });
}