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为何interface中只的属性字段只能用常量呢

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Release： 2016-06-13 12:09:46
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为啥interface中只的属性字段只能用常量呢
为啥不能用$呢,难道用变量就会怎么滴吗
------解决思路----------------------
接口就是现实中的“协议”或“规则”。 你看看手机的USB接口谁能乱改里边的排线，导致不能统一

你别说苹果。。。。。。。。

Related labels：
interface nbsp usb
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