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.Feature.evaluate
透過集合功能整理內容
你可以依據偏好儲存及分類內容。
從伺服器非同步擷取這個物件的值,並傳遞至提供的回呼函式。
用量 | 傳回 |
---|
Feature.evaluate(callback) | |
引數 | 類型 | 詳細資料 |
---|
這個:computedobject | ComputedObject | ComputedObject 例項。 |
callback | 函式 | 伺服器傳回答案時呼叫的函式,格式為 function(success, failure)。如果要求成功,success 引數會包含評估結果。如果要求失敗,失敗引數會包含錯誤訊息。 |
除非另有註明,否則本頁面中的內容是採用創用 CC 姓名標示 4.0 授權,程式碼範例則為阿帕契 2.0 授權。詳情請參閱《Google Developers 網站政策》。Java 是 Oracle 和/或其關聯企業的註冊商標。
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\u003eAllows retrieving the value of a ComputedObject from the server without blocking other operations.\u003c/p\u003e\n"],["\u003cp\u003eUses a callback function that receives the result or an error message upon completion.\u003c/p\u003e\n"],["\u003cp\u003eAccepts a ComputedObject instance and a callback function as parameters.\u003c/p\u003e\n"]]],["The `evaluate` method asynchronously fetches a `ComputedObject`'s value from the server. It takes a `callback` function as an argument, which is executed upon receiving a response. The `callback` function receives two parameters: `success` for the evaluated result if the request was successful, and `failure` for an error message if it failed. The method does not return any value. The request's status and outcome are communicated via the `callback`.\n"],null,["# ee.Feature.evaluate\n\n\u003cbr /\u003e\n\nAsynchronously retrieves the value of this object from the server and passes it to the provided callback function.\n\n\u003cbr /\u003e\n\n| Usage | Returns |\n|------------------------------|---------|\n| Feature.evaluate`(callback)` | |\n\n| Argument | Type | Details |\n|------------------------|----------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| this: `computedobject` | ComputedObject | The ComputedObject instance. |\n| `callback` | Function | A function of the form function(success, failure), called when the server returns an answer. If the request succeeded, the success argument contains the evaluated result. If the request failed, the failure argument will contains an error message. |"]]