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並前往https://developer.mozilla.org/zh-TW/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwnProperty

Object.prototype.hasOwnProperty() - JavaScript - MDN Web ...

每個為 Object 後代的物件都繼承 hasOwnProperty 方法。 ... table still uses the old format, because we haven't yet converted the data it contains.

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