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                [toc] #### 1.Vue2沒有檢測數組 1. vue2中并沒有使用defineProperty來檢測數組,因為數組可能會非常長 2. vue2中采用重寫數組的方法,改寫了push, pop,shift, unshfit等7中會修改原數組的方法,通過修改原型鏈+數據劫持的方式實現 3. 重寫數組方法,無法檢測到索引的更改和數組長度的更改,數組中的元素也會被再次觀測
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