What have we learned today?
NSMutableData *data = [NSMutableData dataWithLength:arr.size];，推荐阅读PDF资料获取更多信息
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But the company may be saving the most interesting news for last; Apple is rumored to be launching a lower-cost MacBook that’s powered by an iPhone chip instead of an M-series processor. Apple itself may have leaked the name of this new machine: it might be called the MacBook Neo.，这一点在WPS下载最新地址中也有详细论述