rui90102

摘要： /--------操作字符串--NSString(静态字符串)---------------------NSString *Beijing= @"北京欢迎您";//字符串的声明NSString *log=@"北京欢迎您a"; //[NSString stringWithFormat:@"I am '%@'",Beijing];//字符串格式化NSString *zhui = [Beijing stringByAppendingString:@"哈哈哈"];//字符串追加bool b=[Beijing 阅读全文