公告：凡是在
2025 年 4 月 15 日前註冊使用 Earth Engine 的非商業專案，都必須
驗證非商業用途資格，才能繼續存取 Earth Engine。
ee.Dictionary.keys
透過集合功能整理內容
你可以依據偏好儲存及分類內容。
以清單形式擷取字典的鍵。金鑰會依自然順序排序。
範例
程式碼編輯器 (JavaScript)
// A dictionary (e.g. results of ee.Image.reduceRegion of an S2 image).
var dict = ee.Dictionary({
B1: 182,
B2: 219,
B3: 443
});
print('The list of dictionary keys', dict.keys());
Python 設定
請參閱
Python 環境頁面，瞭解 Python API 和如何使用 geemap 進行互動式開發。
import ee
import geemap.core as geemap
Colab (Python)
# A dictionary (e.g. results of ee.Image.reduceRegion of an S2 image).
dic = ee.Dictionary({
'B1': 182,
'B2': 219,
'B3': 443
})
print('The list of dictionary keys:', dic.keys().getInfo())
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上次更新時間：2025-07-26 (世界標準時間)。
[null,null,["上次更新時間：2025-07-26 (世界標準時間)。"],[[["\u003cp\u003e\u003ccode\u003eDictionary.keys()\u003c/code\u003e retrieves all keys from a given dictionary and returns them as a list sorted in natural order.\u003c/p\u003e\n"],["\u003cp\u003eThis function is applicable to dictionaries in both JavaScript and Python environments within the Earth Engine context.\u003c/p\u003e\n"],["\u003cp\u003eThe returned list can be printed or used in further operations within your Earth Engine scripts.\u003c/p\u003e\n"]]],["The `keys()` method retrieves a dictionary's keys as a list, sorted in natural order. It requires a dictionary as input (`this: dictionary`). The output is a list of the keys. Examples in JavaScript and Python show creating a dictionary and then using `keys()` to extract the keys, demonstrating the use of the method in different programming environments.\n"],null,["# ee.Dictionary.keys\n\nRetrieve the keys of a dictionary as a list. The keys will be sorted in natural order.\n\n\u003cbr /\u003e\n\n| Usage | Returns |\n|---------------------|---------|\n| Dictionary.keys`()` | List |\n\n| Argument | Type | Details |\n|--------------------|------------|---------|\n| this: `dictionary` | Dictionary | |\n\nExamples\n--------\n\n### Code Editor (JavaScript)\n\n```javascript\n// A dictionary (e.g. results of ee.Image.reduceRegion of an S2 image).\nvar dict = ee.Dictionary({\n B1: 182,\n B2: 219,\n B3: 443\n});\n\nprint('The list of dictionary keys', dict.keys());\n```\nPython setup\n\nSee the [Python Environment](/earth-engine/guides/python_install) page for information on the Python API and using\n`geemap` for interactive development. \n\n```python\nimport ee\nimport geemap.core as geemap\n```\n\n### Colab (Python)\n\n```python\n# A dictionary (e.g. results of ee.Image.reduceRegion of an S2 image).\ndic = ee.Dictionary({\n 'B1': 182,\n 'B2': 219,\n 'B3': 443\n})\n\nprint('The list of dictionary keys:', dic.keys().getInfo())\n```"]]
