Baidu Maps Geolocation API: Get Current Location with Longitude and Latitude

The code snippet provided is using the Baidu Maps API (BMap) to get the current geolocation.\n\n1. It creates a new instance of "BMap.value.Geolocation".\n2. It calls the "getCurrentPosition" method on the "geolocation" object and passes a callback function.\n3. Inside the callback function, it checks if the geolocation response ("res") is not null.\n4. If the geolocation response is not null, it extracts the longitude ("lng") and latitude ("lat") from the "point" property of the response.\n5. It also extracts the province, city, district, street, and street number from the "address" property of the response.\n6. Finally, it sets the "center" value to an object containing the extracted longitude and latitude.\n7. If the geolocation response is null, it sets a default "center" value with a longitude of 115.44892 and a latitude of 38.9183.\n\nNote: This code assumes that the "center" variable is a reactive variable that can be used to update the center of the map based on the geolocation response.