</style> </head> <script> var hour_box = document.querySelector('.hour') var min_box = document.querySelector('.min') var sec_box = document.querySelector('.sec') function getTime(){ var now_time =new Data() var end_time = new Date('2023-5-16 12:00:00') var time = end_time- now_time var hour =Math.floor(time/3600) var min =Math.floor((time-hour*60)/60) var sec =Math.floor(time-hour*3600-min*60) hour = hour < 12?'0'+hour:hour min = min < 12?'0'+min:min sec = sec < 12?'0'+sec:sec hour_box.innerText = hour min_box.innerText = min sec_box.innerText = sec } getTime() setInterval(getTime,1000) </script> <body onload="countTime()"> <div class="box"> <div class="title">京东秒杀 </div><div class="desc">12:00场距结束 </div><div class="items"> <div class="hour">h</div> <div class="time">:</div> <div class="min">m</div> <div class="time">:</div> <div class="sec">s</div> </div> </div> </body>哪里有错

解释每一行<head> <style> .box { display: flex; flex-direction: column; justify-content: center; align-items: center; height: 100vh; background-color: #f2f2f2; } .title { font-size: 36px; font-weight: bold; margin-bottom: 20px; } .desc { font-size: 24px; margin-bottom: 30px; } .items { display: flex; flex-direction: row; justify-content: center; align-items: center; font-size: 48px; font-weight: bold; } .time { margin: 0 10px; } </style> </head> <body onload="countTime()"> 京东秒杀 12:00场距结束 h : m : s <script> var hour_box = document.querySelector('.hour'); var min_box = document.querySelector('.min'); var sec_box = document.querySelector('.sec'); function countTime() { var now_time = new Date(); var end_time = new Date('2023-05-16 12:00:00'); var time = end_time - now_time; var hour = Math.floor(time / 3600000); var min = Math.floor((time - hour * 3600000) / 60000); var sec = Math.floor((time - hour * 3600000 - min * 60000) / 1000); hour = hour < 10 ? '0' + hour : hour; min = min < 10 ? '0' + min : min; sec = sec < 10 ? '0' + sec : sec; hour_box.innerText = hour; min_box.innerText = min; sec_box.innerText = sec; } setInterval(countTime, 1000); </script> </body>

- var hour_box = document.querySelector('.hour');：定义一个名为 hour_box 的变量，并使用 document.querySelector 方法获取名为 hour 的 div 元素。 - var min_box = document.querySelector('.min');：定义...

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> <style> #father { width: 300px; height: 300px; background-color: pink; margin: 100 auto; } </style> </head> <body> <script> let i = document.querySelector(".father") console.log(i); </script> </body> </html>

<title>Document</title> <style> #father { width: 300px; height: 300px; background-color: pink; margin: 100 auto; } </style> </head> <body> <div id="father"> <div id="son"></div> <div></...

<script> var ele= document.querySelector('div'); ____.current= 'no'; </script>

var ele = document.querySelector('div'); ele.setAttribute('data-current', 'no'); </script> 这个代码片段的作用是找到文档中第一个 <div> 元素，将它的 data-current 属性从 "yes" 改成 "no"。

<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>音乐相册</title> <style> @import url("CSS/ring.css"); @import url("CSS/square.css"); /* 定义动画 / @keyframes box-ani{ / 开始动画 / from{ transform: rotateX(-15deg) rotateY(10deg); } / 结束动画 / to{ transform: rotateX(-15deg) rotateY(370deg); } } / 使用动画 */ .box{ animation-name: box-ani; animation-duration: 10s; animation-iteration-count: infinite; animation-timing-function: linear; } </style> </head> <body> <button class="btn">环形</button> <button class="btn-square">正方体</button> </body> <script> var btn =document.querySelector(".btn"); var box =document.querySelector(".box"); var btnSquare=document.querySelector(".btn-square") btn.onclick =function(){ // 现在点击以后要在box的盒子上面添加一个class 为ring的样式 box.classList.remove("square"); box.classList.add("ring"); } btnSquare.onclick =function(){ box.classList.remove("ring"); box.classList.add("square"); } </script> </html>帮我写一个可以添加背景音乐的代码

var box =document.querySelector(".box"); var btnSquare=document.querySelector(".btn-square") btn.onclick =function(){ // 现在点击以后要在box的盒子上面添加一个class 为ring的样式 box....

<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>登录</title> <script src="1.js"></script> </head> <body> 登录 <form> <label for="username">用户名</label> <input type="text" id="username" name="username"> <label for="password">密码</label> <input type="password" id="password" name="password"> <button type="submit">登录</button> </form> </body> </html> const form = document.querySelector('form'); const usernameInput = document.querySelector('#username'); const passwordInput = document.querySelector('#password'); form.addEventListener('submit', e => { e.preventDefault(); const username = usernameInput.value; const password = passwordInput.value; if (username == '姜文俊' && password == '123') { alert('登录成功！'); window.location.href = '网页设计.html'; } else { alert('用户名或密码错误！'); } }); 修改此代码使登录有反应

form.addEventListener('submit', e => { e.preventDefault(); const username = usernameInput.value; const password = passwordInput.value; if (username == '姜文俊' && password == '123') { ...

优化下面的代码，要求固定侧边栏和头部，解决侧边栏遮挡内容显示区域的情况<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>后台管理界面示例</title> <style> body { margin: 0; padding: 0; font-family: Arial, Helvetica, sans-serif; } header { background-color: #333; color: #fff; display: flex; justify-content: space-between; align-items: center; padding: 20px 20px 20px 20px; position: fixed; top: 0; left: 0; right: 0; z-index: 1; } header h1 { margin: 0; font-size: 24px; } header .user { display: flex; align-items: center; cursor: pointer; } header .user img { width: 30px; height: 30px; border-radius: 50%; margin-right: 10px; } .sidebar { background-color: #eee; position: absolute; top: 70px; left: -200px; bottom: 0; width: 200px; padding: 10px; overflow: auto; z-index: 1; transition: left 0.3s ease-in-out; } .sidebar.show { left: 0; } .sidebar h2 { margin: 0; font-size: 18px; margin-bottom: 10px; } .sidebar ul { padding: 0; margin: 0; list-style: none; } .sidebar li { margin-bottom: 5px; } .sidebar a { display: block; padding: 5px 10px; color: #333; border-radius: 5px; text-decoration: none; background-color: #fff; transition: background-color 0.2s ease-in-out; } .sidebar a:hover { background-color: #ddd; } .content { margin: 60px 0 0 220px; padding: 10px; background-color: #f5f5f5; min-height: calc(100vh - 70px - 10px); } </style> </head> <body>
中央管理平台未登录
功能模块 用户管理添加用户删除用户修改用户数据库管理备份数据库还原数据库页面管理添加页面删除页面修改页面 <script> // 动态计算内容区域的左边距，避免与侧边栏重合 function adjustContentMargin() { const sidebarWidth = document.querySelector('.sidebar').offsetWidth; document.querySelector('.content').style.marginLeft = sidebarWidth + 'px'; } adjustContentMargin(); window.addEventListener('resize', adjustContentMargin); // 点击菜单按钮时显示/隐藏侧边栏 document.querySelector('.menu-btn').addEventListener('click', () => { document.querySelector('.sidebar').classList.toggle('show'); }); // 模拟后端数据传来时，只刷新头部和侧边栏之外的区域 setTimeout(() => { document.querySelector('.content').innerHTML = '欢迎使用中央管理平台这里是内容区域，只有在后端有数据传来时才会刷新。'; adjustContentMargin(); // 内容区域高度可能会变化，需要重新计算左边距 }, 3000); </script> </body> </html>

document.querySelector('.menu-btn').addEventListener('click', () => { document.querySelector('.sidebar').classList.toggle('show'); }); // 模拟后端数据传来时，只刷新头部和侧边栏之外的区域 ...

优化下面的代码，解决数据显示区域被侧边栏挡住部分的情况，然后解决大模块展开后与第一个子模块在一起的情况<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>后台管理界面示例</title> <style> body { margin: 0; padding: 0; font-family: Arial, Helvetica, sans-serif; } header { background-color: #333; color: #fff; display: flex; justify-content: space-between; align-items: center; padding: 20px 20px 20px 20px; position: fixed; top: 0; left: 0; right: 0; z-index: 1; } header h1 { margin: 0; font-size: 24px; } header .user { display: flex; align-items: center; cursor: pointer; } header .user img { width: 30px; height: 30px; border-radius: 50%; margin-right: 10px; } .sidebar { background-color: #eee; position: fixed; top: 70px; left: 0; bottom: 0; width: 200px; padding: 10px; overflow: auto; z-index: 1; } .sidebar h2 { margin: 0; font-size: 18px; margin-bottom: 10px; } .sidebar ul { padding: 0; margin: 0; list-style: none; } .sidebar li { margin-bottom: 5px; } .sidebar a { display: block; padding: 5px 10px; color: #333; border-radius: 5px; text-decoration: none; background-color: #fff; transition: background-color 0.2s ease-in-out; } .sidebar a:hover { background-color: #ddd; } .content { margin: 60px 0 0 20px; padding: 10px; background-color: #f5f5f5; min-height: 100vh; margin-left: 200px; } </style> </head> <body>
中央管理平台未登录
功能模块 用户管理添加用户删除用户修改用户数据库管理备份数据库还原数据库页面管理添加页面删除页面修改页面 <script> // 模拟后端数据传来时，只刷新头部和侧边栏之外的区域 setTimeout(() => { document.querySelector('.content').innerHTML = '欢迎使用中央管理平台这里是内容区域，只有在后端有数据传来时才会刷新。'; }, 3000); </script> </body> </html>

document.querySelector('.menu-btn').addEventListener('click', () => { document.querySelector('.sidebar').classList.toggle('show'); }); // 模拟后端数据传来时，只刷新头部和侧边栏之外的区域 ...

<!DOCTYPE html><html lang="en"> <head> <meta charset="UTF-8"> <title>My Interactive Web Page</title> <style> body { background-color: #f2f2f2; font-family: Arial, sans-serif; } h1 { text-align: center; color: #333; } p { font-size: 18px; line-height: 1.5; margin-bottom: 20px; } .container { max-width: 800px; margin: 0 auto; padding: 20px; } .button { display: inline-block; padding: 10px 20px; background-color: #333; color: #fff; text-align: center; text-decoration: none; font-size: 16px; border-radius: 5px; transition: background-color 0.3s ease; cursor: pointer; } .button:hover { background-color: #666; } </style> </head> <body> 欢迎来到我的网站这是一个简单的网页，演示了使用HTML、CSS和JavaScript来创建的体验。. 单击下面的按钮更改页面的背景色: <button class="button" onclick="changeBackgroundColor()">改变颜色</button> 这里是跟多的内容: 百度一下，你就知道淘宝网微博 <script> function changeBackgroundColor() { var body = document.querySelector('body'); body.style.backgroundColor = getRandomColor(); } function getRandomColor() { var letters = '0123456789ABCDEF'; var color = '#'; for (var i = 0; i < 6; i++) { color += letters[Math.floor(Math.random() * 16)]; } return color; } </script> </body> </html>，请在此代码中加入更多内容，使网页显示跟丰富

var body = document.querySelector('body'); body.style.backgroundColor = getRandomColor(); } function getRandomColor() { var letters = '0123456789ABCDEF'; var color = '#'; for (var i = 0; i < 6;...

4. 以下是一段js，实现了点击每一个li弹出每一个li的内容，如何优化这段代码以及给出你的优化意见 html <!DOCTYPE html> <html> <head> <title>笔试题</title> </head> <body> 项目1 项目2 项目3 项目4 <script> var list = document.querySelectorAll('#list>li'); for(let i=0;i </body> </html>

var list = document.querySelector('#list'); list.addEventListener('click', function(event) { if (event.target.tagName === 'LI') { alert(event.target.innerHTML); } }); </script> </body> </html> ...

<!DOCTYPE html><html><head> <title>Cart</title> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"></head><body> Cart Product Quantity <script> var cart = localStorage.getItem('cart'); if (cart) { cart = JSON.parse(cart); var cartTable = document.getElementById('cart'); for (var product in cart) { var row = document.createElement('tr'); var productCell = document.createElement('td'); productCell.textContent = product; var quantityCell = document.createElement('td'); quantityCell.textContent = cart[product]; row.appendChild(productCell); row.appendChild(quantityCell); cartTable.appendChild(row); } } else { alert('Your cart is empty'); } </script></body></html>

<head> <title>Cart</title> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> </head> <body> <h1>Cart</h1> <table> <thead> <tr> <th>Product</th...

已用IE打开了B网页后，怎么样用JS实现在点击链接后用火狐打开/ckb/main.do?action=getMain#这个链接？<html> <head> <meta charset="utf-8"> <title>B网页</title> </head> <body> 我需要打开这个 链接 <script> var link = document.querySelector('a[href="/ckb/main.do?action=getMain#"]'); link.onclick = function() { window.open(link.href, "_blank"); return false; }; </script> </body> </html>

var link = document.querySelector('a[href="/ckb/main.do?action=getMain#"]'); link.onclick = function() { // 判断浏览器是否为IE if (navigator.userAgent.indexOf("MSIE") !== -1 || navigator.userAgent...

<!doctype html> <html> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="initial-scale=1.0, user-scalable=no, width=device-width"> <style> html, body, #container { width: 100%; height: 100%; } #map-zoom, #map-center { color: #0288d1; } </style> <title>地图级别与中心点</title> </head> <body> 获取地图级别与中心点坐标当前级别：11 当前中心点：121.498586,31.239637 <script src="https://webapi.amap.com/maps?v=2.0&key=您申请的key值"></script> <script src="https://a.amap.com/jsapi_demos/static/demo-center/js/demoutils.js"></script> <script> //初始化地图 var map = new AMap.Map('container', { zoom: 11, //初始地图级别 center: [121.498586, 31.239637], //初始地图中心点 }); //显示地图层级与中心点信息 function logMapinfo(){ var zoom = map.getZoom(); //获取当前地图级别 var center = map.getCenter(); //获取当前地图中心位置 document.querySelector("#map-zoom").innerText = zoom; document.querySelector("#map-center").innerText = center.toString(); }; //绑定地图移动与缩放事件 map.on('moveend', logMapinfo); map.on('zoomend', logMapinfo); </script> </body> </html> 转成vue2语法

AMap.loadPlugin('AMap.Map', () => { const map = new AMap.Map('container', { zoom: 11, center: [121.498586, 31.239637], }); function logMapinfo() { const zoom = map.getZoom(); const center = ...

根据这个页面制作一个js完善功能<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>购物车</title> <script src="script.js"></script> </head> <body>
欢迎来到我们的网站！首页商品购物车登录
<main> 购物车商品1 价格：100元 <form> <label for="quantity1">数量：</label> <input type="number" id="quantity1" min="1" value="1"> <button type="submit">更新</button> </form> <button class="remove">删除</button> 商品2 价格：200元 <form> <label for="quantity2">数量：</label> <input type="number" id="quantity2" min="1" value="1"> <button type="submit">更新</button> </form> <button class="remove">删除</button> 总价：300元 <button id="checkout">结算</button> </main>
版权所有 © 2021
</body> </html>

quantityInputs.forEach((input, index) => { const price = input.parentNode.querySelector('p:last-of-type').textContent.slice(3); total += parseInt(price) * parseInt(input.value); }); totalPrice....

我如何将/ckb/main.do?action=getMain#这个链接通过JS实现在点击链接时以火狐打开<html> <head> <meta charset="utf-8"> <title>B网页</title> </head> <body> 我需要用火狐打开这个 链接 <script> // 获取链接元素 var link = document.querySelector('a[href="/ckb/main.do?action=getMain#"]'); // 为链接元素添加点击事件处理函数 link.onclick = function() { // 使用浏览器内置的方法打开链接 window.open(link.href, "firefox.exe"); return false; }; </script> </body> </html>

var link = document.querySelector('a[href="/ckb/main.do?action=getMain#"]'); // 为链接元素添加点击事件处理函数 link.onclick = function() { // 使用浏览器内置的方法打开链接 window.open(link.href, ...

<!DOCTYPE html> <html lang="en"> <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>Document</title> <style> .slider { margin-left: 300px; margin-top: 50px; width: 900px; height: 300px; } .slides img { margin-left: 0px; width: 100%; height: 500px; } </style> </head> <body> </body> <script> const slider = document.querySelector('.slider'); const slides = slider.querySelector('.slides').children; const slideCount = slides.length; let currentIndex = 0; function showSlide(index) { if (index < 0) { index = slideCount - 1; } else if (index >= slideCount) { index = 0; } for (let i = 0; i < slideCount; i++) { slides[i].style.display = 'none'; } slides[index].style.display = 'block'; currentIndex = index; } showSlide(currentIndex); setInterval(() => { showSlide(currentIndex + 1); }, 3000); </script> </html>使用swiper代替这段代码

<title>Document</title>  <link rel="stylesheet" href="https://unpkg.com/swiper/swiper-bundle.min.css" /> </head> <body>  <div class=...

以下代码为什么不能实现从IE打开的B网页点击链接后另外火狐页面打开链接？<html> <head> <meta charset="utf-8"> <title>B网页</title> </head> <body> 我需要打开这个 链接 <script> var link = document.querySelector('a[href="/ckb/login.do?action=login"]'); link.onclick = function() { // 使用浏览器内置的方法打开链接，指定火狐浏览器为打开方式 window.open(link.href, "firefox.exe"); } return false; }; </script> </body> </html>

var link = document.querySelector('a[href="/ckb/login.do?action=login"]'); link.onclick = function() { // 使用浏览器内置的方法打开链接，指定窗口名称为"_blank" window.open(link.href, "_blank"); ...

优化以下代码table样式，table文字之间增加分割线，并增加分页代码： var tableHead = '映射对象id映射对象类型映射对象名称操作'; let tableBody = ''+ obj.dataId +''+ obj.type +''+ obj.dataName +'<button class="info-btn" data-name="张三" data-age="20" data-gender="男">查看</button>' thead.innerHTML = tableHead; tbody.innerHTML = tableBody; // 将元素添加到页面中 popup.appendChild(table); table.appendChild(thead); table.appendChild(tbody); document.body.appendChild(popup);

nextPageBtn.addEventListener('click', () => { const rows = Array.from(tbody.querySelectorAll('tr')); const totalPages = Math.ceil(rows.length / rowsPerPage); if (currentPage < totalPages) { ...

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