NSMultableDictionary NSDictionary
NSMultableArray NSArray
所有对象都继承NSObject，而NSObject存在copy,mutableCopy两个函数，分别返回该对象的非mutable拷贝和multable拷贝
NSMultableDictionary 转 NSDictionary [[dic copy] autorelease]
NSDictionary 转 NSMultableDictionary [[dic mutableCopy] autorelease]
NSMultableArray 转 NSArray [[arr copy] autorelease]
NSArray 转 NSMultableArray [[arr multableCopy] autorelease]
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