NSString *str5 = [[NSString alloc]initWithFormat:@"zhu",@"zhu"];
NSlLog(@"%@",str5);
输出结果：zhu
int a =10;
NSString *str6 = [NSString stringWithFormat:@"zhu","zhu",@"%d",a];
NSlLog(@"%@",str6);
输出结果：zhu

不是会自动拼接的吗？

NSString *str5 = [[NSString alloc]initWithFormat:@"zhu",@"zhu"];
NSlLog(@"%@",str5);
输出结果：zhu
int a =10;
NSString *str6 = [NSString stringWithFormat:@"zhu","zhu",@"%d",a];
NSlLog(@"%@",str6);
输出结果：zhu

不是会自动拼接的吗？