WordPress 4.9.4粘贴功能失效，控制台报TypeError错误求助

Hey there, you’re definitely not alone in this—plenty of users have reported the exact same paste functionality breakage between WordPress 4.9.4 and Chrome 65. The two errors you’re seeing are linked to outdated components in the TinyMCE editor that don’t align with Chrome’s updated clipboard handling. Here are the most reliable fixes:

• Upgrade WordPress to a newer 4.9.x release: WordPress 4.9.4 is quite outdated, and later minor updates (like 4.9.20) include specific patches for browser compatibility issues like this. Before upgrading, make sure to back up your site’s files and database—once you update, the paste function should start working normally again.

• Manually refresh the TinyMCE editor files: If you can’t upgrade your entire WordPress installation right now, you can replace the outdated TinyMCE files in wp-includes/js/tinymce/ with the latest compatible version for the 4.9 branch. Grab the correct files from the WordPress code repository, overwrite the existing ones, then clear your Chrome cache and test Ctrl+V again.

• Troubleshoot conflicting plugins: Third-party plugins that modify the post editor (like SEO tools, content formatting plugins) often cause this conflict. Try deactivating all plugins one by one, testing the paste function after each deactivation. If it starts working, you’ll know which plugin was the culprit—check for an update for that plugin or switch to an alternative.

• Use the "Paste as Text" workaround temporarily: While you fix the root issue, you can use the "Paste as Text" button in the TinyMCE toolbar (the clipboard icon with a "T") to paste content. This skips the broken paste handler and lets you add content without formatting until the main issue is resolved.

To break down the errors briefly: The Uncaught TypeError: Cannot read property 'processPastedContent' of undefined happens because TinyMCE’s paste plugin fails to initialize properly with Chrome 65’s clipboard API changes. The second hasClass error is a related DOM issue where the editor can’t locate the expected elements to process the paste action.

内容的提问来源于stack exchange，提问作者HHeckner