JSONObjectWithData方法里options参数选择解释

NSJSONReadingMutableContainers

Specifies that arrays and dictionaries are created as mutable objects.    //  创建可变的数组或字典 接收

NSJSONReadingMutableLeaves

Specifies that leaf strings in the JSON object graph are created as instances of NSMutableString.   // 指定在JSON对象可变字符串被创建为NSMutableString的实例

NSJSONReadingAllowFragments

Specifies that the parser should allow top-level objects that are not an instance of NSArray
or NSDictionary   //  指定解析器应该允许不属于的NSArray或NSDictionary中的实例顶层对象

测试的
每一项都用字典接收，系统也没有给我报错。难道这是给返回的data类型有关，如果返回的是字典或数组，就用第一项

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