$logFile = "C:\path\to\your\ip_log.txt"
$checkInterval = 300  # 检查间隔，单位为秒（这里设置为5分钟）

function Get-ExternalIP {
    try {
        $ip = Invoke-RestMethod -Uri 'http://ipinfo.io/ip'
        return $ip.Trim()
    }
    catch {
        return $null
    }
}

$lastIP = $null

while ($true) {
    $currentIP = Get-ExternalIP
    $currentTime = Get-Date -Format "yyyy-MM-dd HH:mm:ss"
    
    if ($currentIP...