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看不懂这两行代码啊 请教下

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Release： 2016-06-20 12:32:25
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这两句看不懂 if判断是否定义常量  如果定义了下面代码就不执行了？？ 还有下面又定义常量  第二个if是否永远都是失效的？？？？


回复讨论(解决方案)

对！判断是否定义常量  如果定义了下面代码就不执行

第二个if不会用于失效的，当你的is_login()返回false的时候就生效了

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看不懂这两行代码啊 请教下
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