您可以在纯JavaScript中执行以下操作：向allowedHosts中添加更多主机以跳过它们。

// anonymous function to self contain variables
(()=>{
    // Exclude specific hosts
    const allowedHosts = [ location.host, 'duckduckgo.com', 'stackoverflow.com' ];

    function sanitizeLinks( root = document ){
        // Find all links within element
        const links = [ ...root.getElementsByTagName('a') ];

        // Add root to links if it is a link
        if ( root.nodeName === 'A' ) links.push( root );

        // Loop through all the links
        for ( const link of links ){

            // Skip if rel has been added
            if ( link.rel && link.rel.includes('nofollow') ) continue;

            let skipAddAttrs = false;

            // Check hosts if href is present on link
            if ( link.href ){

                // Loop through allowed hosts
                for ( const host of allowedHosts ){

                    // if link has allowed host skip adding attributes
                    if ( link.href.includes( host ) ){
                        skipAddAttrs = true;
                        break;
                    }
                }
            }

            if ( skipAddAttrs ) continue;

            // add attributes to not allowed links
            link.setAttribute('rel','nofollow');
            link.setAttribute('target','_blank');
            link.setAttribute('title','Click to open in new window');
        }
    } 

    // Observe document changes instead of using setTimeout / setInterval
    const documentObserver = new MutationObserver( ( mutationList, observer ) => {
        let runSanitize = false;

        // Loop through the observed changes
        for ( const mutation of mutationList ) {

            // Loop through any added nodes
            for ( const node of mutation.addedNodes ){
                const isHtmlAnchor = node.nodeName === 'A';
                const hasHtmlAnchor = node.getElementsByTagName('a').length > 0;

                // Skip if no anchor found
                if ( isHtmlAnchor == false && hasHtmlAnchor == false ) continue;

                // Run sanitize only when needed
                sanitizeLinks( node );
            }
        }
    });

    // start the observer and watch subtree changes
    documentObserver.observe( document.documentElement, { childList: true, subtree: true });

    // initial run
    sanitizeLinks();
})();