第17次修改了可删除可持久保存的前端html备忘录：增加年月日星期，增加倒计时，更改保存区名称可以多个备忘录保存不一样的信息，匹配背景主题：现代深色

备忘录代码：

<!DOCTYPE html>
<html lang="zh">
<head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>与妖为邻的文本备忘录</title><style>* {list-style-type: none;padding: 0;margin: 0;}/* 按钮统一样式 */input,button {font-size: 20px;/* 小手 */cursor: pointer;border-radius: 5px;}/* **************************标题区********************************** */.h-div {display: flex;/* 两个块级元素之间间距 */gap: 10px;.h1-div {display: flex;align-items: center;button {margin-left: 45px;}}b {margin: 20px;}#appp {color: #ff0000;.bbbb,.cccc {/* 绝对定位 */position: absolute;}.bbbb {left: 1020px;}.cccc {left: 1160px;}}/* **************************翻牌时钟********************************** */.show {width: 200px;height: 75px;/* margin: 0px auto; */position: relative;color: #ff0000;}.time {display: flex;flex: 1;font-size: 40px;text-align: center;line-height: 75px;padding: 0 10px;overflow: hidden;position: absolute;top: 0px;left: 5px;right: 5px;}.beforeTime {z-index: 100;}.time li:nth-child(2n) {flex: 1;}.time li:nth-child(2n+1) {flex: 4;position: relative;height: 50px;line-height: 50px;margin: auto 0px;border-radius: 10px;box-shadow: 0px 0px 1px 1px rgb(1, 0, 0);}.time li:nth-child(2n+1) .upBox,.time li:nth-child(2n+1) .downBox {position: absolute;left: 0;right: 0;/* overflow: hidden; *//* 删除线 */text-decoration: line-through;text-decoration-color: rgb(69, 63, 63);}.time li:nth-child(2n+1) .upBox {top: 0;bottom: 50%;box-sizing: border-box;background-color: #3b3d3b;transform-origin: bottom;border-radius: 5px 5px 0 0;}.time li:nth-child(2n+1) .downBox {top: 50%;bottom: 0;line-height: 0;box-sizing: border-box;background-color: #3b3d3b;overflow: hidden;transform-origin: top;border-radius: 0 0 5px 5px;}}.down-div {sub {/* 外边距: 上右下左 */margin: 20px;}input[type="checkbox"] {margin: 0 0 0 50px;}.finish {/* 下划线 */text-decoration: underline;text-decoration-color: rgb(255, 0, 0);background-color: rgb(220, 226, 241);color: rgb(253, 250, 250);text-shadow: 1px 1px 1px #030303;box-shadow:inset -2px -2px 3px rgba(255, 255, 255, 0.6),inset 2px 2px 3px rgba(0, 0, 0, 0.6);}}/* *********文本操作框******************************************* */.login {display: none;width: 500px;height: 280px;position: fixed;border: #ebebeb solid 1px;left: 50%;top: 50%;border-radius: 15px 15px 0 0;z-index: 9999;transform: translate(-90%, -90%);border-radius: 15px;background-color: #cce7cc;.login-title {border-radius: 15px 15px 0 0;width: 100%;/*设置文字颜色*/color: #fff;text-shadow: 1px 1px 1px #0c0909;line-height: 40px;height: 40px;font-size: 20px;position: relative;cursor: move;background-color: #b5c7b5;}/*设置X*/#closeBtn {padding: 0px 10px 0px 10px;/*设置X靠右*/float: right;/*设置边框圆角*//*设置文字大小*/font-size: 38px;top: -2px;right: 5px;/*设置绝对定位*/position: absolute;/*设置去掉斜体文字属性*/font-style: normal;/*设置鼠标悬停时显示小手*/cursor: pointer;}& i:hover {color: #110647;}.cl1ose-login {/*设置文字大小*/font-size: 25px;/*设置文字间距*/padding: 10px;}.up-div {display: flex;/*设置主轴方向 垂直显示*/flex-direction: column;border-radius: 10px;background-color: rgba(173, 17, 17, 0.5);height: 220px;margin: 10px;#myForm {display: flex;/*设置主轴方向 垂直显示*/flex-direction: column;box-sizing: border-box;border-radius: 10px;margin: 10px;padding: 5px;background-color: #c4a32c;& input[type="file"] {margin: 10px;background-color: #11b711;border-radius: 10px;}& textarea {font-size: 20px;/* 高 */height: 32px;border-radius: 5px;&::placeholder {font-size: 15px;}}& div {margin: 10px;display: flex;/*设置主轴方向 垂直显示flex-direction: center;*//*设置	居中排列。*/justify-content: center;gap: 80px;}}.up-div1 {margin: 10px;.delete {color: #ff0101;/* 靠右 */float: right;}}}}</style>
</head>
<body><div class="h-div"><!-- --------------------h1-div------------------------------- --><div class="h1-div"><h1><button class="login-header" id="link" href="javascript:;">文本操作框</button><b>备忘录</b><dfn>memo</dfn><a id="appp"></a></h1></div><!-- ------------------------翻牌时钟--------------------------- --><div class="show"><ul class="time"><li><div class="upBox beforeTime"></div><div class="downBox beforeTime"></div><div class="upBox afterTime"></div><div class="downBox afterTime"></div></li><li>:</li><li><div class="upBox beforeTime"></div><div class="downBox beforeTime"></div><div class="upBox afterTime"></div><div class="downBox afterTime"></div></li><li>:</li><li><div class="upBox beforeTime"></div><div class="downBox beforeTime"></div><div class="upBox afterTime"></div><div class="downBox afterTime"></div></li></ul></div></div><!-- ------------------------备忘录--------------------------- --><div id="login" class="login"><div id="title" class="login-title"><span class="cl1ose-login">文本操作</span><i href="javascript:void(0);" id="closeBtn">&times</i></div><div class="up-div"><form id="myForm"><input type="file" name="inputfile" accept="text/plain, text/css, text/html, text/javascript, text/markdown"class="background3D" /><textarea class="up-textarea" name="uptextarea" rows="1" cols="30%"placeholder="请选择txt、js、css或html文件，文件内容会被自动读取"></textarea><div><button type="text" class="up-button">添加</button><input type="reset" value="重置"></div></form><hr><div class="up-div1"><button id="openButton">打开URL</button><button class="a-href"><a href="https://www.baidu.com/s" target="_blank">百度一下</a></button><button class="a-href"><a href="https://blog.csdn.net/lulei5153?spm=1011.2415.3001.5343"target="_blank">与妖为邻</a></button><button id="up-button1" class="delete">对选择删除</button></div></div></div><hr><div class="down-div" id="oContent"><p><sub>护眼背景 &amp;lt;style&amp;gt;body { background-color: #303745;  color: #75a8c6; text-shadow: 1px 1px 1px #000000; }&amp;lt;/style&amp;gt;</sub><sub> &lt;button class="a-href"&gt;&lt;a href="输入网站地址" target="_blank"&gt;输入网站名称&lt;/a&gt; &lt;/button&gt;</sub></p></div>
</body>
<script>/**///格式化时间const formatTime = (time) => {if (time < 10) time = '0' + timereturn time}//翻转前面下面的盒子向上180degconst rotateUp = (ele, time, n) => {//传入的为一开始翻转的元素，即前面下面的盒子，以及新时间，以及第几个li盒子let rotateDeg = 0;ele.style.zIndex = 50;//这个是所有上面的盒子const allUpBox = document.querySelector(`li:nth-child(${n})`).querySelectorAll('.upBox');//所有前面的盒子const beforeTime = document.querySelector(`li:nth-child(${n})`).querySelectorAll('.beforeTime');// 让上面后面的盒子先不可见，然后设置为270°allUpBox[1].style.display = 'none';allUpBox[1].transform = `rotateX(270deg)`;const animation = () => {rotateDeg += 3;ele.style.transform = `perspective(500px) rotateX(${rotateDeg}deg)`;if (rotateDeg == 90) {//让它更新为最近时间后隐藏ele.innerHTML = timeele.style.zIndex = -1;//让刚刚上面隐藏的盒子重新显示出来并且完成90°-180°的旋转allUpBox[1].style.display = 'block';allUpBox[0].style.zIndex = 1;rotateDown(allUpBox[1])allUpBox[1].style.zIndex = 1;}if (rotateDeg == 150) {beforeTime[0].innerHTML = time}if (rotateDeg < 180) {requestAnimationFrame(animation);}}animation()}const rotateDown = (ele) => {let rotateDeg = 270;const animation = () => {rotateDeg += 3;ele.style.transform = `perspective(500px) rotateX(${rotateDeg}deg)`;if (rotateDeg < 360) {requestAnimationFrame(animation);}}animation()}let time = new Date();let oldHour = time.getHours();var oldMinute = time.getMinutes();var oldSecond = time.getSeconds();document.querySelector('li:nth-child(1)').querySelectorAll('.beforeTime').forEach(ele => ele.innerHTML = formatTime(oldHour));document.querySelector(' li:nth-child(3)').querySelectorAll('.beforeTime').forEach(ele => ele.innerHTML = formatTime(oldMinute));document.querySelector(' li:nth-child(5)').querySelectorAll('.beforeTime').forEach(ele => ele.innerHTML = formatTime(oldSecond));const changeTime = () => {let time = new Date();let hour = time.getHours();let minute = time.getMinutes();let second = time.getSeconds();const setHourBox = document.querySelector('li:nth-child(1)').querySelectorAll('.afterTime');if (!setHourBox[0].innerHTML || setHourBox[0].innerHTML != formatTime(hour)) {if (setHourBox[0].innerHTML) rotateUp(document.querySelector('li:nth-child(1)').querySelectorAll('.beforeTime')[1], formatTime(hour), 1);setHourBox.forEach(ele => ele.innerHTML = formatTime(hour));}const setMinuteBox = document.querySelector('li:nth-child(3)').querySelectorAll('.afterTime');if (!setMinuteBox[0].innerHTML || setMinuteBox[0].innerHTML != formatTime(minute)) {if (setMinuteBox[0].innerHTML) rotateUp(document.querySelector('li:nth-child(3)').querySelectorAll('.beforeTime')[1], formatTime(minute), 3);setMinuteBox.forEach(ele => ele.innerHTML = formatTime(minute));}const setSecondBox = document.querySelector('li:nth-child(5)').querySelectorAll('.afterTime')setSecondBox.forEach(ele => ele.innerHTML = formatTime(second));rotateUp(document.querySelector('li:nth-child(5)').querySelectorAll('.beforeTime')[1], formatTime(second), 5)setTimeout(changeTime, 1000);}changeTime();/* **************************倒计时函数********************************** */function showTime2() {var d1 = new Date(); // 当前时间var d = new Date();var y = d.getFullYear();var m = d.getMonth() + 1;var W = "星期" + "日一二三四五六".charAt(new Date().getDay());var D1 = d.getDate();var d2 = new Date(2024, 1, 9, 0, 0, 0); // 2024年3月9日0点0分0秒，月份从0开始计数，所以2月是1var diff = Math.floor((d2 - d1) / 1000); // 计算时间差，单位为秒var D = Math.floor(diff / (24 * 3600)); // 计算天数var H = Math.floor((diff % (24 * 3600)) / 3600); // 计算小时数var M = Math.floor((diff % 3600) / 60); // 计算分钟数var S = diff % 60; // 计算秒数var appp = document.getElementById('appp');appp.innerHTML = '<a class="aaaa">' + y + '年' + m + '月' + D1 + '日' + W + '</a>' + '<a class="bbbb">距离除夕</a><a class="cccc">' + D + '天' + H + '小时' + M + '分钟' + S + '秒</a>'; // 显示倒计时时间差，格式为"X天X小时X分钟X秒"}showTime2();setInterval(showTime2, 1000); // 每隔1秒执行一次showTime函数/**************************备忘录********************************/var uptext = document.querySelector(".up-textarea");var addto = document.querySelector(".up-button");var text = document.querySelector(".down-div");/*************添加事件*****************/addto.onclick = function () {inserhtml(uptext.value, '');// 添加后清空输入框uptext.value = '';// 焦点放回输入框uptext.focus();savetodo();}/*************savetodo函数****************/var savetodo = function () {let todoarr = [];let todojs = {};var econtent = document.querySelectorAll('.content');for (let index = 0; index < econtent.length; index++) {todojs.name = econtent[index].innerHTML;todojs.finish = econtent[index].classList.contains('finish');todoarr.push(todojs);todojs = {};}save(todoarr);}var loadtodo = function () {let todoarr = load();for (let index = 0; index < todoarr.length; index++) {inserhtml(todoarr[index].name, todoarr[index].finish ? 'finish' : '');}}/**********************本地持久储存（localStorage）函数*****************************/var save = function (arr) {/**JSON.stringify(arr) 先将数组转换为字符串   *localStorage.todotext 然后将字符串保存到本地的todotext中*/localStorage.todotext = JSON.stringify(arr);}/***读取函数，把todotext转成数组*然后返回数组*/var load = function (arr) {var arr = JSON.parse(localStorage.todotext);return arr;}/**********************finish样式函数*****************************//**********************按钮点击事件*****************************/text.onclick = function () {var tg = event.target;// 获取父元素下的所有子元素var tgkids = tg.parentElement.children;/*******************************对复选框的点击事件******************************/if (tgkids[0].checked) {tgkids[1].classList.add("finish");}else {tgkids[1].classList.remove("finish");}// 保存更改的样式savetodo();/*******************************对选择的进行删除********************************************/var Select = document.getElementById("up-button1");Select.onclick = function () {if (confirm("是否删除所选？")) {var check = document.getElementsByName("checkbox");for (var i = 0; i < check.length; i++) {if (check[i].checked) {check[i].parentElement.remove();i--;// 删除后保存savetodo();}}}}}var inserhtml = function (val, cls) {text.insertAdjacentHTML("beforeend",`<div><input type="checkbox" name='checkbox'>               <span class='content ${cls}'>${val}</span>   </div>`)}loadtodo();/*****************************提示弹窗无需点击的函数**********************************************/function displayAlert(type, data, time) {var prompt = document.createElement("div");if (type == "success") {prompt.style.width = "200px";prompt.style.backgroundColor = "#009900";} else if (type == "error") {prompt.style.width = "280px";prompt.style.backgroundColor = "#990000";} else if (type == "info") {prompt.style.backgroundColor = " #e6b800";prompt.style.width = "600px";} else {return;}prompt.id = "prompt";prompt.style.textAlign = "center";prompt.style.position = "absolute";prompt.style.height = "60px";prompt.style.marginLeft = "-100px";prompt.style.marginTop = "-30px";prompt.style.left = "30%";prompt.style.top = "5%";prompt.style.color = "white";prompt.style.fontSize = "25px";prompt.style.borderRadius = "20px";prompt.style.textAlign = "center";prompt.style.lineHeight = "60px";if (document.getElementById("") == null) {document.body.appendChild(prompt);prompt.innerHTML = data;setTimeout(function () {document.body.removeChild(prompt);}, time);}}/**************************打开URL按钮的JavaScript******************************************/// 获取打开URL按钮元素var openBtn = document.getElementById("openButton");// 添加点击事件处理程序openBtn.addEventListener('click', function () {// 获取文件路径// 这里假设您已经有一个函数来获取文件路径，例如 prompt('请输入文件路径', 'D:/前端学习', '_blank');var filePath = prompt("请输入网站地址或者本地文件路径", "D:/备忘录信息");if (filePath) {// 使用window.location对象的assign()方法导航到指定文件// window.location.assign(filePath);// 或者使用window.open()方法打开新窗口导航到指定文件window.open(filePath);} else {displayAlert('info', '未提供有效的文件路径！', 1500);// alert("未提供有效的文件路径！");}});/**************************本地文件读取的函数******************************************/window.onload = function () {var text = document.getElementsByName('uptextarea')[0],inputFile = document.getElementsByName('inputfile')[0];//上传文件inputFile.onchange = function () {console.log(this.files);var reader = new FileReader();reader.readAsText(this.files[0], 'UTF-8');reader.onload = function (e) {// urlData就是对应的文件内容var urlData = this.result;text.value = urlData;};};};/**************************复制文本******************************************/var oContent = document.getElementById('oContent');oContent.ondragend = function () {document.execCommand("Copy");// alert("复制成功")displayAlert('error', '复制成功！', 1500);};/********************文本操作框*****************************************/// 1. 获取元素var login = document.querySelector('.login');var mask = document.querySelector('.down-div');// 2. 点击弹出层这个链接link，让mask和login显示出来link.addEventListener('click', function () {mask.style.display = 'block';login.style.display = 'block';});// 3. 点击closeBtn就隐藏mask和logincloseBtn.addEventListener('click', function () {// mask.style.display = 'none';login.style.display = 'none';});// 4. 开始拖拽//（1）当我们鼠标按下，就获得鼠标在盒子内的坐标title.addEventListener('mousedown', function (e) {var x = e.pageX - login.offsetLeft;var y = e.pageY - login.offsetTop;//（2）鼠标移动的时候，把鼠标在页面中的坐标，减去鼠标在盒子内的坐标就是模态框的left和top值document.addEventListener('mousemove', move);function move(e) {login.style.left = e.pageX - x + 'px';login.style.top = e.pageY - y + 'px';}//（3）鼠标弹起，就让鼠标移动事件移除document.addEventListener('mouseup', function () {document.removeEventListener('mousemove', move);});});
</script>
</html>

背景代码：

<!DOCTYPE html>
<html lang="zh">
<a class="a-href">备忘录的背景主题：现代深色</a>
<style>.a-href {background-color: #faee03;color: #48603f;border-radius: 10px;}body {background-color: #2b2b2b;input,button {text-shadow: 1px 1px 1px #000;color: #ffffff;/* 上下左右填充 */padding: 2px 10px;&:hover {background-color: rgb(255, 2, 2);}}}/* <!-- ---------------------3D背景样式---------------------------- --> */.a-href,#prompt,.time,.aaaa,.bbbb,.cccc,b,sub,.h-div,input,button {background-image: linear-gradient(to top left,rgba(0, 0, 0, 0.2),rgba(0, 0, 0, 0.2) 30%,rgba(0, 0, 0, 0));box-shadow: inset 4px 4px 4px rgba(255, 255, 255, 0.6),inset -4px -4px 5px rgba(0, 0, 0, 0.6);border: 0px solid black;}/* 凹进去的样式 */.down-div span,dfn,button:active,input:active {box-shadow: inset -2px -2px 3px rgba(255, 255, 255, 0.6),inset 2px 2px 3px rgba(0, 0, 0, 0.6);}/* ****************标题区***************** */.h-div {background: linear-gradient(0.25turn, rgb(110, 123, 108), rgb(204, 232, 207), #f7d6d6);border-radius: 10px;button {background-color: rgb(255, 2, 2);&:hover {background-color: rgba(60, 203, 4, 0.826);}}b {background-color: #b70202;padding: 2px 10px;border-radius: 50%;color: #fafafa;text-shadow: 0px 1px 0px #999,0px 2px 0px #888,0px 3px 0px #777,0px 4px 0px #666,0px 5px 0px #555,0px 6px 0px #444,0px 7px 0px #333,0px 8px 7px #001135;}.bbbb,dfn {color: #ffffff;-webkit-text-stroke: 1px rgb(249, 9, 41);border-radius: 20px;}.cccc,.aaaa {padding: 2px 10px;text-shadow: 1px 1px 1px #000;}.aaaa,.bbbb,.cccc,.time {background-color: #48603f;border-radius: 20%;}}.down-div {/* background: linear-gradient(0.25turn, #b7efea82, #cacf80ac, #f7d6d6); */background: #303745;p {color: #75a8c6;text-shadow: 1px 1px 1px #000;sub {border-radius: 20px;}}/* 设置复选框样式*/input[type="checkbox"] {background-color: #b8815d;-webkit-appearance: none;appearance: none;width: 25px;height: 25px;position: relative;border-radius: 50%;}input[type="checkbox"]::after {content: "";width: 100%;height: 100%;border: 2px solid #e9f504;position: absolute;left: -3px;top: -3px;border-radius: 50%;}/* 设置复选框点击之后的样式*/input[type="checkbox"]:checked::after {height: 15px;width: 25px;border-top: none;border-right: none;border-radius: 0;transform: rotate(-45deg);transition: all 0.5s ease-in-out;}span {border-radius: 20px;color: #75a8c6;text-shadow: 1px 1px 1px #000;padding: 0 10px;button {background-color: green;a {color: #ffffff;text-shadow: 1px 1px 1px #030303;}}}}/* ***************文本操作窗口****************** */#myForm {textarea {line-height: 1.5em;background: #303745;text-shadow: 1px 1px 1px #000;color: #ffffff;&::placeholder {color: #ffffff;text-shadow: 1px 1px 1px #000000;}}button,input {background: #155f01;&:hover {background-color: rgb(255, 2, 2);}}}.up-div1 {button,input {background: #48603f;a {color: #155f01;}}}
</style></html>