我想检查子网是否存在于给定子网中，或者不是使用javascript

function checkSubnet(subnet, givenSubnet) {
  // 解析给定子网的IP地址范围和网络标识符
  var givenStartIP = givenSubnet.startIP;
  var givenEndIP = givenSubnet.endIP;
  var givenNetworkID = givenSubnet.networkID;

  // 解析待检查子网的IP地址范围和网络标识符
  var startIP = subnet.startIP;
  var endIP = subnet.endIP;
  var networkID = subnet.networkID;

  // 检查子网的IP地址范围是否在给定子网的范围内
  if (startIP >= givenStartIP && endIP <= givenEndIP) {
    // 检查子网的网络标识符是否与给定子网的网络标识符相同
    if (networkID === givenNetworkID) {
      return true; // 子网存在于给定子网中
    }
  }

  return false; // 子网不存在于给定子网中
}

// 示例用法
var givenSubnet = {
  startIP: "192.168.0.1",
  endIP: "192.168.0.254",
  networkID: "192.168.0.0"
};

var subnet = {
  startIP: "192.168.0.10",
  endIP: "192.168.0.20",
  networkID: "192.168.0.0"
};

var result = checkSubnet(subnet, givenSubnet);
console.log(result); // 输出 true