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                #### 1.依賴收集 依賴收集的目的是,當監聽到數據發生變化時,可以更新視圖 #### 2.如何收集 每個屬性都有一個dep屬性,這個是在數據劫持的時候,根據Dep類創建的一個dep實例,每個對象也有一個dep屬性,每個組件在渲染的過程中,都會創建一個渲染watcher watcher有三種: 1. 渲染watcher 2. 計算屬性watcher 3. 用戶watcher 一個屬性可能有多個watcher,反過來一個watcher有多個dep 核心回答: 當調用取值方法get的時候,如果有watcher,就會將watcher收集起來,等會數據變化后,就會觸發set,會通知自己對應的dep觸發更新。調用watcher.update方法
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