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《误识之空案》
Code Crumb · 2026-05-24 · via DEV Community

众码者,终将遇此行:

typeof null // "object"

全屏模式 退出全屏模式

而其应,常立时而至:

“止…何故?”

盖因null非物也。

乃表意之无值。

然则,何故JavaScript视之为物?


调查始矣

昔九十年代,JavaScript之引擎,制以速与存效。

值藏于微渺之卅二位内存容器中。

为速辨所储之值为何,引擎乃用隐秘二进制之标记,名曰标签类型

视之若内证之标。

类此之物:

类型 概念标签
对象 000
整数 001
字符串 010
布尔值 011

(简略概念表征)


重大谬误

对象内隐关联零基类型模式。

null 适有困厄。

其内蕴之象,几尽为虛。

00000000000000000000000000000000

入全屏模式 出全屏模式

故当 JavaScript 检其值之類…

不意与物標相合。

引擎遂解讀如次:

“虛無一物”

为:

“物”

倏忽之间…

null乃误识之。


何故不修此虫?

谬误流布四海。

及开发者觉其弊,天下之网与用,已皆恃此行矣。

更之则破巨量既有之码。

故此虫乃为永存。


开发者之变通

勿书之

typeof value === "object"

入全景模式 出全屏模式

士人习得安查之法。

value !== null && typeof value === "object"

入全景模式 出全屏模式

是故此额外之条件,遂阻之。null免于滑落。


结案

何以致此虫之奇,非独其谬也。

实乃JavaScript之初年,一细枝末节之实也…

犹存于今之应用,历数十载而不衰。

一误之小。

一脉宏业。

一甚奇诡之案发现场。

監視錄影

全案可于抖音查之。

观其证也

君尝遇何等诡异之JavaScript行径?