NSJSONSerialization 转换时 类型注意

进行JSON转化的时候，需要满足一下的要求。

An object that may be converted to JSON must have the following properties:

• The top level object is an NSArray or NSDictionary.
• All objects are instances of NSString,NSNumber,NSArray,NSDictionary,or NSNull.
• All dictionary keys are instances of NSString.
• Numbers are not NaN or infinity.

（编辑：李大同）

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