当用户到达页面时，如何从google adsense广告中获取自定义参数？

<script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
<ins class="adsbygoogle"
     style="display:block"
     data-ad-client="ca-pub-xxxxxxxxxxxxxxxx"
     data-ad-slot="xxxxxxxxxx"
     data-ad-format="auto"
     data-full-width-responsive="true"
     data-custom-param="custom_param_name=custom_param_value">
</ins>
<script>
     (adsbygoogle = window.adsbygoogle || []).push({});
</script>

var ads = document.getElementsByClassName('adsbygoogle');
if (ads.length > 0) {
    var customParam = ads[0].getAttribute('data-custom-param');
    if (customParam) {
        var paramValue = customParam.split('=')[1];
        console.log('Custom parameter value: ' + paramValue);
    }
}