I have set up Ad Units and Key Values in DFP. I have built the site with the following code based on Google's tutorials:
<html lang="en">
<head>
<script type="text/javascript">
var googletag = googletag || {};
googletag.cmd = googletag.cmd || [];
(function() {
var gads = document.createElement("script");
gads.async = true;
gads.type = "text/javascript";
var useSSL = "https:" == document.location.protocol;
gads.src = (useSSL ? "https:" : "http:") + "//www.googletagservices.com/tag/js/gpt.js";
var node =document.getElementsByTagName("script")[0];
node.parentNode.insertBefore(gads, node);
})();
</script>
<script>
var sitePath = "/test-kv/parent/page"
googletag.cmd.push(function() {
var kvAdSlot =
googletag.defineSlot('/00000000' + sitePath, [300, 250], 'kvAd');
kvAdSlot.addService(googletag.pubads());
kvAdSlot.setTargeting('key', 'value');
googletag.pubads().collapseEmptyDivs();
googletag.enableServices();
});
</script>
</head>
<body>
<div id='kvAd'>
<script>
googletag.cmd.push(function() { googletag.display('kvAd'); });
</script>
</div>
</body>
</html>
However, when I test the page, my ROS ads (which have no key values assigned but target all ad units) are showing up. I have been messing with this for a while and cannot figure out why the setTargeting doesn't seem to be working properly to keep non targeted ads out of the key value ad slot.
It's perfectly logical that your ROS ads are returned. Google DFP will not exclude ads based on setTargeting unless specifically defined in your line-item.
In your line-item, if you were to specify that the ROS should be shown IF "key" is not equal to "value", then the ROS ads would not be shown.
来源：https://stackoverflow.com/questions/38959582/gpt-non-key-value-ads-showing-in-key-valuse-ad-slots