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记录上次查看时间

记录上次查看时间。

当前为 2022-07-16 提交的版本，查看 最新版本。

// ==UserScript==
// @name         记录上次查看时间
// @version      0.6.0
// @match      https://www.mcbbs.net/*
// @author       xmdhs
// @license MIT
// @description 记录上次查看时间。
// @namespace https://xmdhs.top
// @require https://lf26-cdn-tos.bytecdntp.com/cdn/expire-1-M/idb-keyval/6.1.0/umd.min.js
// ==/UserScript==

(async function () {
	let tid = document.querySelector("#postlist .plc a[href^='forum.php?mod=viewthread&action=printable']")
	const customStore = idbKeyval.createStore('lastview-db-name', 'lastview-store-name');
	let data = localStorage.getItem("lastview")
	if (data) {
		let o = JSON.parse(data)
		for (const key in o) {
			await idbKeyval.set(String(key), String(o[key]), customStore)
		}
		localStorage.removeItem("lastview")
	}
	try {
		let temp = new URLSearchParams(tid.href)
		tid = temp.get("tid")
	} catch (error) { console.debug(error); }
	if (tid > 0) {
		idbKeyval.set(String(tid), String(new Date().getTime()), customStore)
	} else {
		const dl = document.querySelectorAll("tbody[id^='normalthread_'")
		for (const d of dl) {
			const dom = d.querySelector(".xst")
			let link = dom["href"]
			if (!link) {
				continue
			}
			let tid = link.match(/thread-([0-9]{1,10})-1-[0-9]{1,10}.html/)
			let atime
			if (tid != null && tid.length >= 2) {
				tid = tid[1]
				atime = await idbKeyval.get(tid, customStore)
			} else {
				let b = new URLSearchParams(link)
				tid = b.get("tid")
				if (tid != "") {
					atime = await idbKeyval.get(tid, customStore)
				}
			}
			atime = new Number(atime)
			let lastTime;
			const tDom = d.querySelector("td.by > em > a > span[title]")
			if (tDom) {
				lastTime = Date.parse(tDom["title"])
			} else {
				lastTime = Date.parse(d.querySelector("td.by > em > a").textContent)
			}
			if (atime > 0) {
				let d = document.createElement("span")
				d.textContent = `[${diffTime(new Date(atime), new Date())}]`
				d.style.fontWeight = "bolder"
				if (lastTime > atime) {
					d.style.color = "red"
					d.addEventListener('click', (e) => {
						e.preventDefault()
						window.open(`forum.php?mod=redirect&tid=${tid}&goto=lastpost#lastpost`, "_blank")
						d.style.color = ""
					})
				}
				dom.insertBefore(d, dom.firstChild)
			}
		}
	}

	unsafeWindow.lastViewClean = async (s = 2592000000) => {
		const keys = await idbKeyval.keys(customStore)
		const t = new Date().getTime() - s
		for (const k of keys) {
			const v = await idbKeyval.get(k, customStore)
			if (Number(v) < t) {
				await idbKeyval.del(k, customStore)
			}
		}
	}
})();

// https://www.jianshu.com/p/bdda96a1dcd8
function diffTime(startDate, endDate) {
	var diff = endDate.getTime() - startDate;//.getTime();//时间差的毫秒数

	//计算出相差天数
	var days = Math.floor(diff / (24 * 3600 * 1000));

	//计算出小时数
	var leave1 = diff % (24 * 3600 * 1000);    //计算天数后剩余的毫秒数
	var hours = Math.floor(leave1 / (3600 * 1000));
	//计算相差分钟数
	var leave2 = leave1 % (3600 * 1000);        //计算小时数后剩余的毫秒数
	var minutes = Math.floor(leave2 / (60 * 1000));

	//计算相差秒数
	var leave3 = leave2 % (60 * 1000);      //计算分钟数后剩余的毫秒数
	var seconds = Math.round(leave3 / 1000);

	var returnStr = seconds + "秒前";
	if (minutes > 0) {
		returnStr = minutes + "分钟前";//+ returnStr;
	}
	if (hours > 0) {
		returnStr = hours + "小时前";// + returnStr;
	}
	if (days > 0) {
		returnStr = days + "天前";//+ returnStr;
	}
	return returnStr;
}