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                # `canDeactivate(transition) [-> Promise | Boolean]` 在驗證階段,當一個組件將要被切出的時候被調用。 ### 參數 - [`transition {Transition}`](hooks.md#transition-object) 調用 `transition.next()` 可以斷定( resolve )此鉤子函數。調用 `transition.abort()` 可以無效化并取消此次切換。 ### 預期返回值 - 可選擇性返回 Promise : - `resolve(true)` -> `transition.next()` - `resolve(false)` -> `transition.abort()` - `reject(reason)` -> `transition.abort(reason)` - 可選擇性返回 Boolean 值: - `true` -> `transition.next()` - `false` -> `transition.abort()` ### 詳情 此鉤子函數的調用順序是從下至上。組件的 `canDeactivate` 鉤子僅在子級組件的 `canDeactivate` 被斷定( resolved )之后調用。
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