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                ## typeof NaN 的結果是什么? `NaN` 意指“不是一個數字”(not a number),NaN 是一個“警戒值”(sentinel value,有特殊用途的常規值),用于指出數字類型中的錯誤情況,即“執行數學運算沒有成功,這是失敗后返回的結果”。 ```js typeof NaN; // "number" ``` `NaN` 是一個特殊值,它和自身不相等,是唯一一個非自反(自反,reflexive,即 `x === x` 不成立)的值。而 `NaN != NaN` 為 true。
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