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虽然为了演示 typeof 的作用而省略了 if 块内的语句,但此处的正、误两个示例,其意图正好相反,不知会否给某些读者造成误会。此处修改假设代码的意图为“如果v已定义”。
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虽然为了演示 typeof 的作用而省略了 if 块内的语句,但此处的正、误两个示例,其意图正好相反,不知会否给某些读者造成误会。此处修改假设代码的意图为“如果v已定义”。