H5 of 11__GeoLocation Geolocation
GeoLocation API is usually used for mobile devices to obtain geographical location. Strictly speaking, it does not belong to the standard specification of H5.
1 How to use GeoLocation API ?
To use this API, obtain access to geolocation through window.navigator.geolocatio. This object has the following three methods:
1. getCurrentPosition()
2. watchPosition()
3. clearWatch()
The getCurrentPosition() method can pass three parameters, as shown below:
void getCurrentPosition(PositionCallback successCallback, optional PositionErrorCallback errorCallback, optional PositionOptions options);
The first one The first parameter is a required parameter, and the last two are optional parameters.
Look at an example:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
<title>GeoLocation API 地理定位</title>
<script type="text/javascript">
window.navigator.geolocation.getCurrentPosition(function(pos){
alert("当前地理位置的纬度： " +pos.coords.latitude
+"\n当前地理位置的经度： " +pos.coords.longitude
+ "\n当前经纬度的精度： " +pos.coords.accuracy
+ "\n设备的当前运动方向： " +pos.coords.heading
+ "\n设备的当前速度： " +pos.coords.speed
);
});
var watchID= window.navigator.geolocation.watchPosition(function(pos){
alert("当前位置变化的纬度： " +pos.coords.latitude
+"\n当前位置变化的经度： " +pos.coords.longitude
+ "\n当前经纬度变化的精度： " +pos.coords.accuracy
+ "\n设备的当前运动方向： " +pos.coords.heading
+ "\n设备的当前变化的速度： " +pos.coords.speed);
navigator.geolocation.clearWatch(watchID);
}, function(){
});
</script>
</head>
<body>
</body>
</html>
After calling getCurrentPosition() successfully, In the callback function, you can obtain the geographical location information of the current user when accessing the Web page through the parameter object.
#pos object contains a coords attribute. The coords attribute Represents a series of geographical coordinate information.
latitude: latitude (decimal)
longitude: longitude (decimal)
altitude: altitude
acuracy: the accuracy of latitude and longitude coordinates (in meters)
altitudeAccuracy: in meters The altitude coordinate accuracy level
heading: Direction of movement (specified by the angle of clockwise rotation relative to true north)
speed: current Ground speed (in m/s)
pos also contains a timestamp attribute, which is used to create a timestamp in milliseconds when returning the coords object.
The rendering is as follows:
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