Thread Navigating by Arrow keys

Use ← or → and Ctrl to navigate to previous, next, first or last page
当前为 2015-01-04 提交的版本，查看最新版本。
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// ==UserScript==
// @name        Thread Navigating by Arrow keys
// @author      theheroofvn
// @include     /^.*(thread|forum).*$/
// @require     http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js
// @grant       none
// @namespace   https://gf.qytechs.cn/scripts/6849-next-prev-by-arrow-key
// @description Use ← or → and Ctrl to navigate to previous, next, first or last page
// @version     3.5
// ==/UserScript==
this.$ = this.jQuery = jQuery.noConflict(true);
$(document).ready(function() {
    var detect_forum,
        prev, next, first, last,
        up, up_sub = '[itemtype="http://data-vocabulary.org/Breadcrumb"] > a';
    if ($('script[src*="vbulletin"]').length > 0) {
        detect_forum = 'v';
        prev = 'a[rel="prev"]';
        next = 'a[rel="next"]';
        first = 'a[rel="start"]';
        last = 'a[title^="Last"], a[title*="uối"]';
        up = 'span.navbar a, li.navbit a';
    } else if ($('script[src*="xenforo"]').length > 0) {
        detect_forum = 'x';
        prev = '.PageNav a.text:first-child';
        next = last = '.PageNav a.text:last-child';
        first = 'a[rel="start"]';
        up = 'a.crumb';
    } else return;
    var multi = {
            17: false,
            8: false,
            37: false,
            39: false
        },
        multi1 = {
            17: false,
            8: false
        },
        multi2 = {
            17: false,
            37: false
        },
        multi3 = {
            17: false,
            39: false
        };
    var nav = {
        prev: $(prev)[0],
        next: $(next)[0],
        first: $(first)[0],
        last: function() {
            if (detect_forum == 'v') return $(last)[0];
            else if (detect_forum == 'x') return $(last).prev()[0];
        },
        up: function() {
            return ($(up).length > 0) ? $(up).last()[0] : $(up_sub).last()[0];
        }
    };
    $(window).keydown(function(event) {
        var key = event.keyCode,
            action = null,
            link;
        if (key in multi) multi[key] = true; else return;
        if (key in multi1) {
            if (multi[17] && multi[8]) action = "up";
        } else if (key in multi2) {
            if (!multi[17] && multi[37]) action = "prev";
            else if (multi[17] && multi[37]) action = "first";
        } else if (key in multi3) {
            if (!multi[17] && multi[39]) action = "next";
            else if (multi[17] && multi[39]) action = "last";
        }
        if (!action || event.target.tagName == "INPUT" || event.target.tagName == "TEXTAREA") return;
        if (typeof nav[action] === "function") link = nav[action](); else link = nav[action];
        window.location = link.href;
    }).keyup(function(event) {
        if (event.keyCode in multi) multi[event.keyCode] = false;
    });
});
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