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                ThinkChat2.0新版上線,更智能更精彩,支持會話、畫圖、視頻、閱讀、搜索等,送10W Token,即刻開啟你的AI之旅 廣告
                # WatchedValue # WatchedValue WatchedValue對象由一些[Trading Terminal](book/Trading-Terminal.md)方法返回。 使用這個對象,你可以獲得/設置值,并在值改變時得到通知。 ### value() 返回當前值。 ### setValue(value) 設置新價值。 ### subscribe(callback, options) 1. `callback` 值被改變時被調用的函數 2. `options` 具有以下屬性的對象: 1. `once` - 如果是true,回調將只執行一次 2. `callWithLast` - 如果它是true,回調將被執行以前的值(如果可用) ### unsubscribe(callback) 使用您在`subscribe`函數中使用的相同函數來取消訂閱更新。
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