属性用copy、strong修饰的区别：
http://blog.csdn.net/runintolove/article/details/50767523
关键字copy与mutableCopy的详解:
https://www.jianshu.com/p/700f58eb0b86
属性用copy、strong修饰的区别：
http://blog.csdn.net/runintolove/article/details/50767523
关键字copy与mutableCopy的详解:
https://www.jianshu.com/p/700f58eb0b86
本文标题：copy与strong、copy与mutableCopy的区别
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