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驗證非商業用途資格，才能繼續存取 Earth Engine。
ee.Dictionary.size
透過集合功能整理內容
你可以依據偏好儲存及分類內容。
傳回字典中的項目數。
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 number of dictionary entries', dict.size());
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 number of dictionary entries:', dic.size().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\u003eThe \u003ccode\u003esize()\u003c/code\u003e method returns the number of entries (key-value pairs) within an Earth Engine Dictionary object.\u003c/p\u003e\n"],["\u003cp\u003eThis method is useful for determining the size or length of a dictionary, such as one generated from image analysis operations.\u003c/p\u003e\n"],["\u003cp\u003eUsage involves calling \u003ccode\u003esize()\u003c/code\u003e on a Dictionary object (e.g., \u003ccode\u003edictionary.size()\u003c/code\u003e), which returns an integer representing the entry count.\u003c/p\u003e\n"],["\u003cp\u003eExamples are provided in both JavaScript and Python demonstrating the application of the \u003ccode\u003esize()\u003c/code\u003e method with Earth Engine Dictionaries.\u003c/p\u003e\n"]]],[],null,["# ee.Dictionary.size\n\nReturns the number of entries in a dictionary.\n\n\u003cbr /\u003e\n\n| Usage | Returns |\n|---------------------|---------|\n| Dictionary.size`()` | Integer |\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 number of dictionary entries', dict.size());\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 number of dictionary entries:', dic.size().getInfo())\n```"]]
