如果未提供回调函数,则以同步方式发出请求。如果提供了回调,则会异步发出请求。
建议使用异步模式,因为同步模式在等待服务器时会停止所有其他代码(例如 EE 代码编辑器界面)。如需发出异步请求,建议使用 evaluate() 而不是 getInfo()。
返回此对象的计算值。
用法 | 返回 |
---|---|
Date.getInfo(callback) | 对象 |
参数 | 类型 | 详细信息 |
---|---|---|
此:computedobject | ComputedObject | ComputedObject 实例。 |
callback | 函数(可选) | 可选的回调。如果未提供,则以同步方式进行调用。 |
示例
代码编辑器 (JavaScript)
/** * WARNING: this function transfers data from Earth Engine servers to the * client. Doing so can negatively affect request processing and client * performance. Server-side options should be used whenever possible. * Learn more about the distinction between server and client: * https://developers.google.com/earth-engine/guides/client_server */ // A server-side ee.Date object. var dateServer = ee.Date('2021-4-30'); // Use getInfo to transfer server-side date to the client. The result is // an object with keys "type" and "value" where "value" is milliseconds since // Unix epoch. var dateClient = dateServer.getInfo(); print('Client-side date is an object', typeof dateClient); print('Object keys include "type" and "value"', Object.keys(dateClient)); print('"value" is milliseconds since Unix epoch', dateClient.value); print('Client-side date in JS Date constructor', new Date(dateClient.value));
import ee import geemap.core as geemap
Colab (Python)
""" WARNING: this function transfers data from Earth Engine servers to the client. Doing so can negatively affect request processing and client performance. Server-side options should be used whenever possible. Learn more about the distinction between server and client: https://developers.google.com/earth-engine/guides/client_server """ from datetime import datetime # A server-side ee.Date object. date_server = ee.Date('2021-4-30') # Use getInfo to transfer server-side date to the client. The result is # a dictionary with keys "type" and "value" where "value" is milliseconds since # Unix epoch. date_client = date_server.getInfo() print('Client-side date is a dictionary:', type(date_client)) print('Dictionary keys include "type" and "value":', date_client.keys()) print('"value" is milliseconds since Unix epoch:', date_client['value']) print('Client-side date in Python:', datetime.fromtimestamp(date_client['value'] / 1000))