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JavaScript：null是對象嗎？

時間：2021-07-28 21:16:58 阅读：0 評論：0 收藏：0 [點我收藏+]

標簽：存儲版本類型表示 rip 錯誤一個 bug 系統

null是对象吗？为什么？

答：null不是對象。

原因：虽然 typeof null 会输出 object，但是这只是 JS 存在的一個悠久 Bug。在 JS 的最初版本中使用的是 32 位系統，为了性能考虑使用低位存儲变量的類型信息，000 开头代表是对象然而 null 表示为全零，所以将它錯誤的判断为 object 。

JavaScript：null是對象嗎？

標簽：存儲版本類型表示 rip 錯誤一個 bug 系統

原文地址：https://www.cnblogs.com/XF-eng/p/15067419.html

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