html5指南-4.使用Geolocation实现定位功能
<table border="1">
<tr>
<th>Longitude:</th>
<td id="longitude">-</td>
<th>Latitude:</th>
<td id="latitude">-</td>
</tr>
<tr>
<th>Altitude:</th>
<td id="altitude">-</td>
<th>Accuracy:</th>
<td id="accuracy">-</td>
</tr>
<tr>
<th>Altitude Accuracy:</th>
<td id="altitudeAccuracy">-</td>
<th>Heading:</th>
<td id="heading">-</td>
</tr>
<tr>
<th>Speed:</th>
<td id="speed">-</td>
<th>Time Stamp:</th>
<td id="timestamp">-</td>
</tr>
<tr>
<th>Error Code:</th>
<td id="errcode">-</td>
<th>Error Message:</th>
<td id="errmessage">-</td>
</tr>
</table>
<script>
navigator.geolocation.getCurrentPosition(displayPosition, handleError);
function displayPosition(pos) {
var properties = ["longitude", "latitude", "altitude", "accuracy", "altitudeAccuracy", "heading", "speed"];
for (var i = 0; i < properties.length; i++) {
var value = pos.coords[properties[i]];
document.getElementById(properties[i]).innerHTML = value;
}
document.getElementById("timestamp").innerHTML = pos.timestamp;
}
function handleError(err) {
document.getElementById("errcode").innerHTML = err.code;
document.getElementById("errmessage").innerHTML = err.message;
}
</script>
</body>
</html>
拒绝授权，运行结果：
getCurrentPosition(callback,errorCallback,options)中的options有如下参数可以使用，enableHighAccuracy：使用最好的效果；timeout：超时时间（毫秒）；maximumAge：指定缓存时间（毫秒）。我们来下下面的例子：
复制代码代码如下:
<!DOCTYPE HTML>
<html>
<head>
<title>Example</title>
<style>
table{border-collapse: collapse;}
th, td{padding: 4px;}
th{text-align: right;}
</style>
</head>
<body>
<table border="1">
<tr>
<th>Longitude:</th>
<td id="longitude">-</td>
<th>Latitude:</th>
<td id="latitude">-</td>
</tr>
<tr>
<th>Altitude:</th>
<td id="altitude">-</td>
<th>Accuracy:</th>
<td id="accuracy">-</td>
</tr>
<tr>
<th>Altitude Accuracy:</th>
<td id="altitudeAccuracy">-</td>
<th>Heading:</th>
<td id="heading">-</td>
</tr>
<tr>
<th>Speed:</th>
<td id="speed">-</td>
<th>Time Stamp:</th>
<td id="timestamp">-</td>
</tr>
<tr>
<th>Error Code:</th>
<td id="errcode">-</td>
<th>Error Message:</th>
<td id="errmessage">-</td>
</tr>
</table>
<script>
var options = {
enableHighAccuracy: false,
timeout: 2000,
maximumAge: 30000
};
navigator.geolocation.getCurrentPosition(displayPosition, handleError, o