随着科技的发展,网购已成为大家生活中必不可少的一个模式,各种电商平台也如雨后春笋般涌现出来,今天我们就来用原生js来实现类似淘宝选购物品时的放大镜效果.
这里要用到大小两张图片,我选取的是800x800和350x350大小的两张图片
图片来源于网络
首先写出html和css样式
html部分
<body> <div class="min"> <img src="/static/imghwm/default1.png" data-src="img/1.jpg" class="lazy" / alt="如何用原生javascript实现放大镜效果_html/css_WEB-ITnose" > <div class="fd"></div> </div> <div class="max"><img src="/static/imghwm/default1.png" data-src="img/2.jpg" class="lazy" / alt="如何用原生javascript实现放大镜效果_html/css_WEB-ITnose" ></div> </body>
原理是创建min和max两个区域,将小图img/1.jpg和创建的放大镜divfd放到min中,将大图img/2.jpg放到max中
css样式部分
<style type="text/css"> .min{ width: 350px; height: 350px; border: 1px solid black; float: left; position: relative; } .max{ width: 350px; height: 350px; border: 1px solid black; float: left; display: none; overflow: hidden; position: relative; } .max img{ position: absolute; margin: 0 auto; } .fd{ width: 153.125px; height: 153.125px; background-color: skyblue; opacity: 0.3; position: absolute; top: 0; left: 0; display: none; } 这里需要强调的是 2.放大镜的宽高,如果按照我选的尺寸的两张图宽高必须为153.125px,否则会出现左侧所选区域和右侧显示区域不能完全吻合的情况; 3.大图的父级max定义的框尺寸为什么比里面的图片小?(这里的框相当于一个窗户,里面的图片相当于窗子一面的物体,无论里面的物体多大也只能显示出窗子的尺寸) 4.当鼠标放在小图外区域时,大图和放大镜无显示,所以开始置max和fd里display:none;
为了显示效果我们先把display:none注掉,此时效果如下
样式图
js部分
首先分析逻辑顺序
定义变量1.鼠标覆盖显示max和fd2.确定放大镜的移动范围(不能出min)3.max的对应显示然后按顺序书写代码
<script type="text/javascript"> var min = document.querySelector(".min"), max = document.querySelector(".max"), img = document.querySelector(".max img"), fd = document.querySelector(".fd"); 操作 min.onmouseover = function(){ //1.鼠标覆盖显示max和fd max.style.display = "block"; fd.style.display = "block"; } //离开时隐藏 min.onmouseout= function(){ max.style.display = "none"; fd.style.display = "none"; } //2.fd的移动范围 min.onmousemove = function(){ //鼠标触摸的点 var x = event.clientX-min.offsetLeft-fd.offsetWidth/2; var y = event.clientY-min.offsetTop-fd.offsetHeight/2; //最大移动距离 var maxX = min.clientWidth-fd.offsetWidth; var maxY = min.clientHeight-fd.offsetHeight; //边界判断 if(x<=0){ x=0; }else if(x>=maxX){ x=maxX; } if(y<=0){ y=0; }else if(y>=maxY){ y=maxY; } //fd的位置 fd.style.left = x+"px"; fd.style.top = y+"px"; //fd/min = max/img //移动比例 var yidongX = x/maxX; var yidongY = y/maxY; //移动 //3.max的对应显示 // 对于大图而言 放大镜在小图上移动的比例 相当于img在可显示区域上移动的比例 放大镜右移等于图片左移 // 也就是本质上为img - max 然而需要负值 则*-1 简化后 为max-img img.style.left = yidongX * (max.clientWidth - img.offsetWidth) + "px"; img.style.top = yidongY * (max.clientHeight - img.offsetHeight) + "px"; }</script> 最后根据需求完善即可实现效果如下
1.gif
HTML vs. CSS vs. JavaScript: A Comparative OverviewApr 16, 2025 am 12:04 AMThe roles of HTML, CSS and JavaScript in web development are: HTML is responsible for content structure, CSS is responsible for style, and JavaScript is responsible for dynamic behavior. 1. HTML defines the web page structure and content through tags to ensure semantics. 2. CSS controls the web page style through selectors and attributes to make it beautiful and easy to read. 3. JavaScript controls web page behavior through scripts to achieve dynamic and interactive functions.
HTML: Is It a Programming Language or Something Else?Apr 15, 2025 am 12:13 AMHTMLisnotaprogramminglanguage;itisamarkuplanguage.1)HTMLstructuresandformatswebcontentusingtags.2)ItworkswithCSSforstylingandJavaScriptforinteractivity,enhancingwebdevelopment.
HTML: Building the Structure of Web PagesApr 14, 2025 am 12:14 AMHTML is the cornerstone of building web page structure. 1. HTML defines the content structure and semantics, and uses, etc. tags. 2. Provide semantic markers, such as, etc., to improve SEO effect. 3. To realize user interaction through tags, pay attention to form verification. 4. Use advanced elements such as, combined with JavaScript to achieve dynamic effects. 5. Common errors include unclosed labels and unquoted attribute values, and verification tools are required. 6. Optimization strategies include reducing HTTP requests, compressing HTML, using semantic tags, etc.
From Text to Websites: The Power of HTMLApr 13, 2025 am 12:07 AMHTML is a language used to build web pages, defining web page structure and content through tags and attributes. 1) HTML organizes document structure through tags, such as,. 2) The browser parses HTML to build the DOM and renders the web page. 3) New features of HTML5, such as, enhance multimedia functions. 4) Common errors include unclosed labels and unquoted attribute values. 5) Optimization suggestions include using semantic tags and reducing file size.
Understanding HTML, CSS, and JavaScript: A Beginner's GuideApr 12, 2025 am 12:02 AMWebdevelopmentreliesonHTML,CSS,andJavaScript:1)HTMLstructurescontent,2)CSSstylesit,and3)JavaScriptaddsinteractivity,formingthebasisofmodernwebexperiences.
The Role of HTML: Structuring Web ContentApr 11, 2025 am 12:12 AMThe role of HTML is to define the structure and content of a web page through tags and attributes. 1. HTML organizes content through tags such as , making it easy to read and understand. 2. Use semantic tags such as, etc. to enhance accessibility and SEO. 3. Optimizing HTML code can improve web page loading speed and user experience.
HTML and Code: A Closer Look at the TerminologyApr 10, 2025 am 09:28 AMHTMLisaspecifictypeofcodefocusedonstructuringwebcontent,while"code"broadlyincludeslanguageslikeJavaScriptandPythonforfunctionality.1)HTMLdefineswebpagestructureusingtags.2)"Code"encompassesawiderrangeoflanguagesforlogicandinteract
HTML, CSS, and JavaScript: Essential Tools for Web DevelopersApr 09, 2025 am 12:12 AMHTML, CSS and JavaScript are the three pillars of web development. 1. HTML defines the web page structure and uses tags such as, etc. 2. CSS controls the web page style, using selectors and attributes such as color, font-size, etc. 3. JavaScript realizes dynamic effects and interaction, through event monitoring and DOM operations.
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
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
Atom editor mac version download
The most popular open source editor
MinGW - Minimalist GNU for Windows
This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.
EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function
Dreamweaver Mac version
Visual web development tools
Notepad++7.3.1
Easy-to-use and free code editor
