7 lines
262 B
Markdown
7 lines
262 B
Markdown
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---
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title: Undefined Primitive Value
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localeTitle: 未定义的原始值
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---
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自动分配给刚刚声明的变量的原始值或没有实际参数的正式参数。
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[MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/undefined)
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