做一个端口扫描器。对于根据IP地址扫描处有点疑惑。定义的变量大概有这些。
我的困惑在于：1、为什么type=0时为IP，type=1时为主机？这是自己随意定的么。2、红框处 等号后边会什么会有一对空的双引号？
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My confusion is, why did you ask if you didn’t write this yourself? Even if it was found somewhere else, does it have to be correct?
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
My confusion is, why did you ask if you didn’t write this yourself? Even if it was found somewhere else, does it have to be correct?