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                ## `with() {}` 不要使用 使用 `with` 讓你的代碼在語義上變得不清晰. 因為 `with` 的對象, 可能會與局部變量產生沖突, 從而改變你程序原本的用義. 下面的代碼是干嘛的? ``` with (foo) { var x = 3; return x; } ``` 答案: 任何事. 局部變量 `x` 可能被 `foo` 的屬性覆蓋, 當它定義一個 setter 時, 在賦值 `3` 后會執行很多其他代碼. 所以不要使用 `with` 語句.
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