使用定制的NSMutableDictionary方法对NSMutableArray排序
首先，给NSMutableDictionary建一个分类，里面加上自定义的排序方法。
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头文件：
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{ Age = 26; Name = Michael;},{ Age = 32; Name = Josh;},{ Age = 24; Name = Eric;},{ Age = 25; Name = Emilla;},{ Age = 22; Name = Echo;}?