Open Links in NEW BACKGROUND Tab

Open links (esp. from different domains) in NEW BACKGROUND tab with normal left click
当前为 2022-12-26 提交的版本，查看最新版本。
换行
// ==UserScript==
// @name            Open Links in NEW BACKGROUND Tab
// @author          Jerry
// @description     Open links (esp. from different domains) in NEW BACKGROUND tab with normal left click
// @grant           GM_openInTab
// @include         http*://*
// @namespace       https://greasyfork.org/users/28298
// @run-at          document-start
// @version         0.3
// @license         GNU GPLv3
// ==/UserScript==
 
 
// source:
// https://greasyfork.org/en/scripts/20694-all-links-open-all-in-new-background-tab/code
// https://greasyfork.org/en/scripts/12367-open-links-in-new-tab/code
 
attachHandler([].slice.call(document.getElementsByTagName('a')));
 
setMutationHandler(document, 'a', function(nodes) {
    attachHandler(nodes);
    return true;
});
 
function attachHandler(nodes) {
    nodes.forEach(function(node) {
        // href will be auto expanded with window.location.origin, such as href="#" --> "https://example.com/#"
        // search-engine-a: more compatible with Search Engine Switcher script
        if ( (node.target != '_blank') && (node.href) && (!node.href.includes("javascript:")) && (!node.href.startsWith(window.location.origin)) && (node.className!="search-engine-a") ) {
            node.onclick = clickHandler;
            node.addEventListener('click', clickHandler);
        }
    });
}
 
/* 
https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent/buttons
MouseEvent.buttons  
0: No button or un-initialized
1: Primary button (usually the left button)
2: Secondary button (usually the right button)
4: Auxiliary button (usually the mouse wheel button or middle button)
8: 4th button (typically the "Browser Back" button)
16 : 5th button (typically the "Browser Forward" button)
 
https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent
KeyboardEvent.metaKey
e.metaKey
 
https://stackoverflow.com/a/35936912/2292993
e is short for event
the element on which you clicked (event.target)
 
https://developer.mozilla.org/en-US/docs/Web/API/Event/stopPropagation
The stopPropagation() method of the Event interface prevents further propagation of the current event in the capturing and bubbling phases. It does not, however, prevent any default behaviors from occurring; for instance, clicks on links are still processed. If you want to stop those behaviors, see the preventDefault() method. It also does not prevent immediate propagation to other event-handlers. If you want to stop those, see stopImmediatePropagation(). 
*/
function clickHandler(e) {
    if (e.button > 1)
        return;
    e.preventDefault();
    e.stopPropagation();
    e.stopImmediatePropagation();
    // GM_openInTab(this.href, e.button || e.ctrlKey);
    GM_openInTab(this.href, true); // open in background
}
 
 
 
 
// https://greasyfork.org/scripts/12228/code/setMutationHandler.js
// ==UserScript==
// @name          setMutationHandler
// @description   MutationObserver wrapper to wait for the specified CSS selector
// @namespace     wOxxOm.scripts
// @author        wOxxOm
// @grant         none
// @version       3.0.2
// ==/UserScript==
 
function setMutationHandler(target, selector, handler, options) {
// or    setMutationHandler(selector, handler, options) {
// or    setMutationHandler(options) {
    if (typeof arguments[0] == 'string') {
        options = arguments[2] || {};
        handler = arguments[1];
        selector = arguments[0];
        target = document;
    } else if (arguments.length == 1 && target && typeof target.handler == 'function') {
        options = arguments[0];
        handler = options.handler;
        selector = options.selector;
        target = options.target || document;
    } else if (!(target instanceof Node)) {
        throw 'Bad params for setMutationHandler.\n' +
            'A: [optional Node] target, [String] selector, [Function] handler, [optional Object] options\n' +
            'B: [Object] options\n' +
            'Options: target, selector, handler, processExisting, childList, attributes, characterData, subtree, attributeOldValue, characterDataOldValue, attributeFilter';
    } else
        options = options || {};
 
    if (options.processExisting && target.querySelector(selector))
        handler.call(null, Array.prototype.slice.call(target.querySelectorAll(selector)));
    if (!options.attributes && !options.characterData && !options.childList && options.subtree === undefined)
        options.childList = options.subtree = true;
 
    var cb;
    if (/^#[\w\d-]+$/.test(selector)) {
        selector = selector.substr(1);
        cb = MOhandlerForId;
    } else {
        cb = MOhandler;
    }
    var observer = new MutationObserver(cb);
    observer.observe(target, options || {subtree:true, childList:true});
    return observer;
 
    function MOhandler(mutations) {
        if (mutations.length > 100 && !document.querySelector(selector))
            return;
        var found = [];
        for (var i=0, m; (m = mutations[i++]); ) {
            switch (m.type) {
                case 'childList':
                    var nodes = m.addedNodes, nl = nodes.length;
                    var textNodesOnly = true;
                    for (var j=0; j < nl; j++) {
                        var n = nodes[j];
                        textNodesOnly &= n.nodeType == 3; // TEXT_NODE
                        if (n.nodeType != 1) // ELEMENT_NODE
                            continue;
                        if (n.matches(selector))
                            found.push(n);
                        else if (n.querySelector(selector)) {
                            n = n.querySelectorAll(selector);
                            if (n.length < 1000)
                                found.push.apply(found, n);
                            else
                                found = found.concat(found.slice.call(n));
                        }
                    }
                    if (textNodesOnly && m.target.matches(selector))
                        found.push(m.target);
                    break;
                case 'attributes':
                    if (m.target.matches(selector))
                        found.push(m.target);
                    break;
                case 'characterData':
                    if (m.target.parentNode && m.target.parentNode.matches(selector))
                        found.push(m.target.parentNode);
                    break;
            }
        }
        if (!found.length)
            return;
        if (handler.call(observer, found) === false)
            observer.disconnect();
    }
 
    function MOhandlerForId(mutations) {
        var el = document.getElementById(selector);
        if (el && target.contains(el))
            if (handler.call(observer, [el]) === false)
                observer.disconnect();
    }
}