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A primitive value automatically assigned to variables that have just been declared or to formal arguments for which there are no actual arguments.
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- Undefined value on Wikipedia
我们的志愿者还没有将这篇文章翻译为 中文 (简体)。加入我们帮助完成翻译！
A primitive value automatically assigned to variables that have just been declared or to formal arguments for which there are no actual arguments.