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                ## 內部屬性 [[Class]] 是什么? 所有 `typeof` 返回值為 `"object"` 的對象(如數組)都包含一個內部屬性 `[[Class]]`(我們可以把它看作一個內部的分類,而非傳統的面向對象意義上的類)。這個屬性無法直接訪問,一般通過 `Object.prototype.toString(..)` 來查看。例如: ```js Object.prototype.toString.call( [1,2,3] ); // "[object Array]" Object.prototype.toString.call( /regex-literal/i ); // "[object RegExp]" // 我們自己創建的類就不會有這份特殊待遇,因為 toString() 找不到 toStringTag 屬性時只好返回默認的 Object 標簽 // 默認情況類的[[Class]]返回[object Object] class Class1 {} Object.prototype.toString.call(new Class1()); // "[object Object]" // 需要定制[[Class]] class Class2 { get [Symbol.toStringTag]() { return "Class2"; } } Object.prototype.toString.call(new Class2()); // "[object Class2]" ``` #### 詳細資料可以參考: * [《Symbol.toStringTag》](https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Symbol/toStringTag)
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