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                >[warning] typeof運算符 --- JS是弱類型語言, 在運行時會判斷類型, 利用typeof可以打印出對應的類型, 使用方式 * typeof(表達式) * typeof 變量 結果如下 | 示例 | 結果 | 運行時類型 | | --- | --- | --- | | "ok" | string | String | | 3 | number | Number | | true | boolean | Boolean | | undefined | undefined | undefined | | null | object | Null | | {} | object | Object | | [] | object | Array | | Symbol() | symbol | Symbol | | NaN | number | NaN | | (function(){}) | function | Object | 需要特殊記憶, null -> object, 引用都是object, NaN -> number
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