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                ## isNaN 和 Number.isNaN 函數的區別? 函數 `isNaN` 接收參數后,會嘗試將這個參數轉換為數值,任何不能被轉換為數值的的值都會返回 `true`,因此非數字值傳入也會返回 `true` ,會影響 `NaN` 的判斷。 函數 `Number.isNaN` 會首先判斷傳入參數是否為數字,如果是數字再繼續判斷是否為 `NaN` ,這種方法對于 `NaN` 的判斷更為準確。
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