Thread Navigating by Arrow keys

Use ← or → and Ctrl to navigate to previous, next, first or last page
当前为 2015-04-04 提交的版本，查看最新版本。
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// ==UserScript==
// @name        Thread Navigating by Arrow keys
// @namespace   https://gf.qytechs.cn/scripts/6849-thread-navigating-by-arrow-keys
// @description Use ← or → and Ctrl to navigate to previous, next, first or last page
// @author      theheroofvn
// @include     /^.*(thread|forum|diendan).*$/
// @include     http://www.vn-zoom.com/*
// @require     http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js
// @grant       none
// @version     5.5
// ==/UserScript==
if (frameElement) return;
this.$ = this.jQuery = jQuery.noConflict(true);
$(document).ready(function() {
    var prev, next, first, last, up, up_sub = '[itemtype="http://data-vocabulary.org/Breadcrumb"] a';
    var site_info = [ 
        {
            host: "www.webtretho.com",
            prev: "a.arrowPrePage",
            next: "a.arrowNextPage",
            first: "a.arrowFstPage",
            last: "a.arrowLstPage"
        },
        {
            host: "forum.bkav.com.vn",
            prev: "a.js-pagenav-prev-button",
            next: "a.js-pagenav-next-button",
            first: "a[data-page='1']",
            last: "a.js-pagenav-button:nth-last-child(2)",
            up: "#breadcrumbs a.crumb-link"
        }
    ];
    function custom_site(list) {
        if (list.length === 0) return 0;
        for (var i = 0; i < list.length; i++) {
            if (location.hostname == list[i].host) {
                prev = list[i].prev;
                next = list[i].next;
                first = list[i].first;
                last = list[i].last;
                up = list[i].up;
                return 1;
            }
        }
        return 0;
    }
    function checkScriptExist(script) {
        return $('script[src*="' + script + '"]').length > 0 ? true : false;
    }
    function detect_forum() {
        var result = "";
        if (checkScriptExist("vbulletin")) result = "vbb"; else if (checkScriptExist("xenforo")) result = "xenforo"; else if (checkScriptExist("general.js")) result = "mybb"; else if (checkScriptExist("forum_fn.js")) result = "phpbb";
        return result;
    }
    var detect = detect_forum();
    if (custom_site(site_info) === 0) {
        if (detect == "vbb") {
            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 (detect == "xenforo") {
            prev = ".PageNav a.text:first-child";
            next = ".PageNav a.text:last-child";
            last = ".PageNav nav > a:nth-last-child(2)";
            first = 'a[rel="start"]';
            up = "a.crumb";
        } else if (detect == "mybb") {
            prev = "a.pagination_previous";
            next = "a.pagination_next";
            first = "a.pagination_first";
            last = "a.pagination_last";
            up = ".navigation > a";
        } else if (detect == "phpbb") {
            prev = ".display-options a.left-box.left";
            next = ".display-options a.right-box.right";
            first = ".pagination > span > a:first-child";
            last = ".pagination > span > a:last-child";
            up = ".navlinks > .icon-home a";
        } else return;
    }
    var multi = {17:!1,8:!1,37:!1,39:!1}, multi1 = {17:!1,8:!1}, multi2 = {17:!1,37:!1}, multi3 = {17:!1,39:!1};
    var nav = {
        prev: $(prev)[0],
        next: $(next)[0],
        first: $(first)[0],
        last: $(last)[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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