css background ver
请问css中BACKGROUND: url(img/passport/login/bg_top.jpg?ver=2)中ver=2是什么意思如题，谢谢！
回复讨论(解决方案)
.navigation { HEIGHT: 50px; BACKGROUND: url(img/passport/login/bg_top.jpg?ver=2) repeat-x; POSITION: fixed; Z-INDEX: 2000; TOP: 0px; WIDTH: 100%; box-shadow: 0 0 5px 3px #888; _position: absolute} 这个css完整的如上，应该是设置一个不动的导航条，
最后部分 _position: absolute 这个_position与POSITION: fixed;的区别是什么
_position: absolute 是IE6下HACK的写法. 意思就是只有IE6使用它;
bg_top.jpg?ver=2 这一个版本,cdn 加速相关的?.
我加上ver=2后，这个背景就看不到了。这个是什么用
我加上ver=2后，这个背景就看不到了。这个是什么用
呵呵.你加v=??什么都可以看到的.
记得前面的?
img/passport/login/bg_top.jpg?ver=2
没明白，ver=2什么意思啊？！
从字面上看version的意思。
但我没看过这样的用法，直接无视。
怀疑写错了吧？或者自动生成的？
img/passport/login/bg_top.jpg?ver=1
img/passport/login/bg_top.jpg?ver=2
img/passport/login/bg_top.jpg?ver=3
img/passport/login/bg_top.jpg?ver=4
img/passport/login/bg_top.jpg?ver=5
指定图片的url版本 防止更新的缓存
谢谢大家的回答，指定了图片的版本，有什么用呢？
to kk3k2005:
不理解“防止更新的缓存”这句是什么意思?
就好比a.html?a=123一样 a.jpg?b=123也是需要浏览器发送请求的
URL后面的参数有什么用就得看处理这个request的程序怎么处理了
能正确读取图片的路径罢了
Difficulty in updating caching of official account web pages: How to avoid the old cache affecting the user experience after version update?Mar 04, 2025 pm 12:32 PMThe official account web page update cache, this thing is simple and simple, and it is complicated enough to drink a pot of it. You worked hard to update the official account article, but the user still opened the old version. Who can bear the taste? In this article, let’s take a look at the twists and turns behind this and how to solve this problem gracefully. After reading it, you can easily deal with various caching problems, allowing your users to always experience the freshest content. Let’s talk about the basics first. To put it bluntly, in order to improve access speed, the browser or server stores some static resources (such as pictures, CSS, JS) or page content. Next time you access it, you can directly retrieve it from the cache without having to download it again, and it is naturally fast. But this thing is also a double-edged sword. The new version is online,
How do I use HTML5 form validation attributes to validate user input?Mar 17, 2025 pm 12:27 PMThe article discusses using HTML5 form validation attributes like required, pattern, min, max, and length limits to validate user input directly in the browser.
How to efficiently add stroke effects to PNG images on web pages?Mar 04, 2025 pm 02:39 PMThis article demonstrates efficient PNG border addition to webpages using CSS. It argues that CSS offers superior performance compared to JavaScript or libraries, detailing how to adjust border width, style, and color for subtle or prominent effect
What are the best practices for cross-browser compatibility in HTML5?Mar 17, 2025 pm 12:20 PMArticle discusses best practices for ensuring HTML5 cross-browser compatibility, focusing on feature detection, progressive enhancement, and testing methods.
What is the purpose of the <datalist> element?Mar 21, 2025 pm 12:33 PMThe article discusses the HTML <datalist> element, which enhances forms by providing autocomplete suggestions, improving user experience and reducing errors.Character count: 159
What is the purpose of the <progress> element?Mar 21, 2025 pm 12:34 PMThe article discusses the HTML <progress> element, its purpose, styling, and differences from the <meter> element. The main focus is on using <progress> for task completion and <meter> for stati
How do I use the HTML5 <time> element to represent dates and times semantically?Mar 12, 2025 pm 04:05 PMThis article explains the HTML5 <time> element for semantic date/time representation. It emphasizes the importance of the datetime attribute for machine readability (ISO 8601 format) alongside human-readable text, boosting accessibilit
What is the purpose of the <meter> element?Mar 21, 2025 pm 12:35 PMThe article discusses the HTML <meter> element, used for displaying scalar or fractional values within a range, and its common applications in web development. It differentiates <meter> from <progress> and ex
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
ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment
SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.
EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function
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
Atom editor mac version download
The most popular open source editor
