使用node.js编写端口扫描工具（第一部分代码）

const dns = require('dns');
const net = require('net');

const validOptions = [
  {
    "name": "ports",
    "cmd": ["-p", "--ports"],
    "value": "1-10,80",
    "min": 1,
    "max": 65535,
    "type": "range",
    "description": "The port or range of ports to scan (e.g. '80', '1-1024', '80,443'). Default: '1-65535'.",
    "description_zh": "要扫描的端口或端口范围（例如：'80'，'1-1024'，'80,443'）。默认值：'1-65535'。"
  },
  {
    "name": "timeout",
    "cmd": ["-t", "--timeout"],
    "value": 10000,
    "type": "number",
    "description": "The timeout for each port scan, in milliseconds. Default: 10000.",
    "description_zh": "每个端口扫描的超时时间（毫秒）。默认值：10000。"
  },
  {
    "name": "maxQueueSize",
    "cmd": ["-q", "--max-queue-size"],
    "value": 100,
    "type": "number",
    "description": "The maximum size of the scan queue. Default: 100.",
    "description_zh": "扫描队列的最大大小。默认值：100。"
  },
  {
    "name": "showAll",
    "cmd": ["-a", "--show-all"],
    "value": false,
    "type": "bool",
    "description": "Show all ports, including closed and timed out ports.",
    "description_zh": "显示全部端口，包含关闭和超时的端口。"
  },
  {
    "name": "help",
    "cmd": ["-h", "--help"],
    "value": false,
    "type": "bool",
    "description": "Show usage information.",
    "description_zh": "显示使用说明。"
  }
];