text: //
  //  NSNull+JSON.h
  //  XJKit
  //
  //  Created by 曾宪杰 on 2018/7/27.
  //  Copyright © 2018年 曾宪杰. All rights reserved.
  //
  
  #import <Foundation/Foundation.h>
  
  @interface NSNull (JSON)
  - (NSUInteger)length;
  - (NSInteger)integerValue;
  - (float)floatValue;
  - (NSString *)description;
  - (NSArray *)componentsSeparatedByString:(NSString *)separator;
  - (id)objectForKey:(id)key;
  - (BOOL)boolValue;
  - (NSRange)rangeOfCharacterFromSet:(NSCharacterSet *)aSet;
  
  @end
  