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xxx749

关于判断一个应为整数类型的变量是否为 undefined 的问题

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  •   xxx749 · Sep 21, 2018 via Android · 2680 views
    This topic created in 2911 days ago, the information mentioned may be changed or developed.
    a 为 int 或 undefined

    为什么 a !== undefined 的运行时间比!isNaN(parseInt(a))来的长
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