新增脚本 tampermonkey/v2ex.com/v2ex-mark-read.js 标记 V2ex 中已读的帖子标题，如果有新回复，帖子标题将会恢复未读状态。

tampermonkey/v2ex.com/v2ex-mark-read.js

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+// ==UserScript==
+// @name         V2ex Helper - Mark read
+// @namespace    http://tampermonkey.net/
+// @version      0.1
+// @description  Mark read posts with background color and save state in json.
+// @author       You
+// @match        https://v2ex.com/*
+// @icon         https://www.google.com/s2/favicons?sz=64&domain=v2ex.com
+// @require      https://static.sunrui.ink:8888/tampermonkey.js?t=23423367
+// @grant        GM_addStyle
+// @grant        GM_getValue
+// @grant        GM_setValue
+// @run-at       document-start
+// @license      MIT
+// ==/UserScript==
+
+(function () {
+    // 'use strict';
+    GM_addStyle(`
+        .cell.read {
+            background-color: antiquewhite;
+        }
+    `);
+
+    function getWebsite() {
+        // Get website domain
+        return window.location.hostname;
+    }
+
+    function getJsonDataObject() {
+        return JSON.parse(GM_getValue(getWebsite(), '{}'));
+    }
+
+    function setUrlRead(url) {
+        // Set url as read
+        var data = getJsonDataObject();
+        data[url] = true;
+        GM_setValue(getWebsite(), JSON.stringify(data));
+    }
+
+    function isUrlRead(url) {
+        // Check if url is read
+        var data = getJsonDataObject();
+        return data[url] === true;
+    }
+
+    function getMainPageCells() {
+        // Get main page cells
+        return document.querySelectorAll('#Main div.cell.item');
+    }
+
+    function getTopicsPageCells() {
+        // Get topics page cells
+        return document.querySelectorAll('#TopicsNode .cell');
+    }
+
+    function getCells() {
+        const mainCells = getMainPageCells();
+        const topicsCells = getTopicsPageCells();
+        if (mainCells.length > 0) {
+            return mainCells;
+        }
+        if (topicsCells.length > 0) {
+            return topicsCells;
+        }
+        return [];
+    }
+
+    function findLinks() {
+        return Array.from(getCells()).map((cell) => { return cell.querySelector('.item_title a').href; });
+    }
+
+    var pm = new PageManager();
+
+    const condition = () => {
+        return findLinks().length > 0;
+    }
+
+    // record current page as read
+    setUrlRead(window.location.href);
+
+    pm.stage('Add color to viewd topics')
+        .on(condition)
+        .logLevel(1)
+        .act((logger) => {
+            logger('Add color to viewd topics');
+            // find all cells
+            var cells = getCells();
+            // add color to read topics
+            Array.from(cells).forEach((cell) => {
+                const link = cell.querySelector('.item_title a').href;
+                logger(`${link} is ${isUrlRead(link) ? 'read' : 'unread'}`);
+                if (isUrlRead(link)) {
+                    cell.classList.add('read');
+                }
+            });
+            logger('Done', 2);
+            return false;
+        })
+        .every(1000)
+        .run();
+
+})();