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原先「变量未定义」的说法欠妥,此处未定义的应是初始值,而不是变量。
另外原先感觉是把
undefined
形容成洪水猛兽了,添加了一个正常使用undefined
的例子。另外修正了 precommit 发现的拼写错误:indentifier→identifier。