AMP实验无法开启及AMP X启动缓慢问题求助：AMP.isExperimentOn()返回false

Hey there, I’ve dealt with similar headaches with AMP experiments before, so let me walk through some fixes that helped me and other devs get past these issues:

• Double-check your experiment configuration
  AMP experiments won’t activate if your setup is off even by a small typo. Make sure your <head> has the correct experiment ID, rollout percentage, and associated variables. For example, if you’re using amp-experiment, verify the JSON config is properly formatted—missing commas or incorrect IDs are super common culprits that make AMP.isExperimentOn() return false.

• Bust Chrome’s AMP and site cache
  Chrome holds onto AMP resources tight, which can prevent fresh experiment code from loading. Try these steps:

  1. Go to chrome://settings/siteData, search for your domain, and delete all stored data.
  2. Append ?amp_cache=bust to your AMP URL to force a fresh cache load temporarily.
  3. Restart Chrome after clearing cache to ensure old resources aren’t lingering.

• Rule out extension interference
  Your incognito mode clue is a big hint here—incognito disables most extensions by default, so one of yours is likely messing with AMP runtime. Ad blockers, privacy tools, or even DOM-modifying extensions can block experiment initialization or slow down AMP X. Disable extensions one by one, testing the experiment each time, to find the troublemaker.

• Ensure you’re using a compatible AMP runtime version
  Some experiments only work with specific AMP runtime versions. If you’re loading an older v0.js script, the experiment might no longer be supported. Update your AMP script tag to pull the latest stable version:

  <script async src="https://cdn.ampproject.org/v0.js"></script>
  

  Or cross-check the requirements for your specific experiment to confirm compatible runtime versions.

• Debug with AMP’s built-in tools
  The AMP DevTools extension for Chrome is your best friend here. Install it, open DevTools, navigate to the AMP tab, and look for errors related to experiment setup or AMP X initialization. It’ll flag issues like invalid configs, missing permissions, or runtime conflicts that aren’t obvious in regular DevTools.

• Check for conflicting AMP components
  If you’re using other AMP tools like amp-analytics, amp-script, or custom extensions, they might be clashing with the experiment or slowing down AMP X. Try removing non-essential components temporarily—if the experiment starts working, reintroduce them one by one to pinpoint the conflict.

内容的提问来源于stack exchange，提问作者akabiru