CSS:
*{padding: 0;margin: 0;}ul,li{list-style: none;}.cont{ width: 600px; margin:30px auto;}.cont h3{ border-bottom: 2px solid #bbb; width: 100%; height: 38px;}#ul1{ position: relative; width: 100%;}#ul1>li{ float: left; margin-top: 15px; margin-left: 15px; position: relative;}.pro{ width: 180px; height: 200px; overflow: hidden;}.pro img{ width: 180px; height: 150px; overflow: hidden;}.pro p{ text-align: center;}.hidden{ display: none;}.active{ width: 300px; height: 120px; padding: 10px; overflow: hidden; position: absolute; top: -80px; left: 20px; display: block; background: #eee; border: 1px solid #ccc; z-index: 1;}.active li{ color: #e4007e; font-size: 14px; padding-left: 12px; height: 30px; line-height: 30px;}/* 清除浮动 */.clearfix{ zoom: 1;}.clearfix:after{ content: '.'; height: 0; display: block; clear: both; visibility: hidden;}
HTML:
<div class="cont"> <h3 id="最近更新">最近更新</h3> <ul id="ul1" class="clearfix"> <li> <div class="pro"> <img src="/static/imghwm/default1.png" data-src="img/small.jpg" class="lazy" alt="JS练习嵌套列表(for循环)_html/css_WEB-ITnose" > <p>开心一刻</p> <p>动漫类</p> </div> <ul class="hidden"> <li>开不厌“坐不凡” 宝马全新730Li试驾快评</li> <li>3D打印无法替代 汽车设计师如何玩泥巴?</li> <li>比亚迪元换装个性LOGO 瞬间高大上了许多</li> </ul> </li> <li> <div class="pro"> <img src="/static/imghwm/default1.png" data-src="img/small-02.jpg" class="lazy" alt="JS练习嵌套列表(for循环)_html/css_WEB-ITnose" > <p>盆景养成记</p> <p>植物类</p> </div> <ul class="hidden"> <li>开不厌“坐不凡” 宝马全新730Li试驾快评</li> <li>3D打印无法替代 汽车设计师如何玩泥巴?</li> <li>比亚迪元换装个性LOGO 瞬间高大上了许多</li> </ul> </li> <li> <div class="pro"> <img src="/static/imghwm/default1.png" data-src="img/small-03.jpg" class="lazy" alt="JS练习嵌套列表(for循环)_html/css_WEB-ITnose" > <p>盆景养成记</p> <p>植物类</p> </div> <ul class="hidden"> <li>开不厌“坐不凡” 宝马全新730Li试驾快评</li> <li>3D打印无法替代 汽车设计师如何玩泥巴?</li> <li>比亚迪元换装个性LOGO 瞬间高大上了许多</li> </ul> </li> <li> <div class="pro"> <img src="/static/imghwm/default1.png" data-src="img/small-04.jpg" class="lazy" alt="JS练习嵌套列表(for循环)_html/css_WEB-ITnose" > <p>插花艺术</p> <p>艺术类</p> </div> <ul class="hidden"> <li>开不厌“坐不凡” 宝马全新730Li试驾快评</li> <li>3D打印无法替代 汽车设计师如何玩泥巴?</li> <li>比亚迪元换装个性LOGO 瞬间高大上了许多</li> </ul> </li> <li> <div class="pro"> <img src="/static/imghwm/default1.png" data-src="img/small-05.jpg" class="lazy" alt="JS练习嵌套列表(for循环)_html/css_WEB-ITnose" > <p>插花艺术</p> <p>艺术类</p> </div> <ul class="hidden"> <li>开不厌“坐不凡” 宝马全新730Li试驾快评</li> <li>3D打印无法替代 汽车设计师如何玩泥巴?</li> <li>比亚迪元换装个性LOGO 瞬间高大上了许多</li> </ul> </li> <li> <div class="pro"> <img src="/static/imghwm/default1.png" data-src="img/small-06.jpg" class="lazy" alt="JS练习嵌套列表(for循环)_html/css_WEB-ITnose" > <p>开心一刻</p> <p>动漫类</p> </div> <ul class="hidden"> <li>开不厌“坐不凡” 宝马全新730Li试驾快评</li> <li>3D打印无法替代 汽车设计师如何玩泥巴?</li> <li>比亚迪元换装个性LOGO 瞬间高大上了许多</li> </ul> </li> </ul></div>
JS:
<script type="text/javascript"> var oUl1=document.getElementById('ul1'); var aUl=oUl1.getElementsByTagName('ul');//ul数组 var aDiv=oUl1.getElementsByTagName('div'); for (var i = 0; i < aDiv.length; i++) { aDiv[i].index=i;//索引值 //鼠标经过当前div时,当前li下的div内容显示 aDiv[i].onmouseover=function(){ aUl[this.index].className='active'; } //鼠标离开当前div时,当前li下的div内容隐藏 aDiv[i].onmouseout=function(){ aUl[this.index].className='hidden'; } };</script>

The future of HTML will develop in a more semantic, functional and modular direction. 1) Semanticization will make the tag describe the content more clearly, improving SEO and barrier-free access. 2) Functionalization will introduce new elements and attributes to meet user needs. 3) Modularity will support component development and improve code reusability.

HTMLattributesarecrucialinwebdevelopmentforcontrollingbehavior,appearance,andfunctionality.Theyenhanceinteractivity,accessibility,andSEO.Forexample,thesrcattributeintagsimpactsSEO,whileonclickintagsaddsinteractivity.Touseattributeseffectively:1)Usese

The alt attribute is an important part of the tag in HTML and is used to provide alternative text for images. 1. When the image cannot be loaded, the text in the alt attribute will be displayed to improve the user experience. 2. Screen readers use the alt attribute to help visually impaired users understand the content of the picture. 3. Search engines index text in the alt attribute to improve the SEO ranking of web pages.

The roles of HTML, CSS and JavaScript in web development are: 1. HTML is used to build web page structure; 2. CSS is used to beautify the appearance of web pages; 3. JavaScript is used to achieve dynamic interaction. Through tags, styles and scripts, these three together build the core functions of modern web pages.

Setting the lang attributes of a tag is a key step in optimizing web accessibility and SEO. 1) Set the lang attribute in the tag, such as. 2) In multilingual content, set lang attributes for different language parts, such as. 3) Use language codes that comply with ISO639-1 standards, such as "en", "fr", "zh", etc. Correctly setting the lang attribute can improve the accessibility of web pages and search engine rankings.

HTMLattributesareessentialforenhancingwebelements'functionalityandappearance.Theyaddinformationtodefinebehavior,appearance,andinteraction,makingwebsitesinteractive,responsive,andvisuallyappealing.Attributeslikesrc,href,class,type,anddisabledtransform

TocreatealistinHTML,useforunorderedlistsandfororderedlists:1)Forunorderedlists,wrapitemsinanduseforeachitem,renderingasabulletedlist.2)Fororderedlists,useandfornumberedlists,customizablewiththetypeattributefordifferentnumberingstyles.

HTML is used to build websites with clear structure. 1) Use tags such as, and define the website structure. 2) Examples show the structure of blogs and e-commerce websites. 3) Avoid common mistakes such as incorrect label nesting. 4) Optimize performance by reducing HTTP requests and using semantic tags.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool

DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software

SublimeText3 Chinese version
Chinese version, very easy to use

SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.

Dreamweaver Mac version
Visual web development tools
