NSMutableArray -init vs. +arrayWithCapacity:
参考链接:
http://stackoverflow.com/questions/22395963/understanding-arraywithcapacity-method-on-nsmutablearray
http://stackoverflow.com/questions/1730706/nsmutablearray-init-vs-arraywithcapacity
参考链接: https://discussions.apple.com/docs/DOC-3083
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