HTML 5应用程序缓存使用总结
近期接触了HTML5本地缓存，在HTML页面的html标签加入后缀为.appcache的文件，即可以轻松地创建 web 应用的离线版本。
使用本地缓存带来的好处：
离线浏览 - 用户可在应用离线时使用它们
速度 - 已缓存资源加载得更快
减少服务器负载 - 浏览器将只从服务器下载更新过或更改过的资源。
浏览器支持：
所有主流浏览器均支持应用程序缓存，除了 IE
HTML5 Cache Manifest 实例
下面的例子展示了带有 cache manifest 的 HTML 文档（供离线浏览）：
HTML页面
demo.appcache文件
Cache Manifest 基础
如需启用应用程序缓存，请在文档的 标签中包含 manifest 属性：
<!DOCTYPE HTML><html manifest="demo.appcache">...</html>
每个指定了 manifest 的页面在用户对其访问时都会被缓存。如果未指定 manifest 属性，则页面不会被缓存（除非在 manifest 文件中直接指定了该页面）。
manifest 文件的建议的文件扩展名是：".appcache"。
请注意，manifest 文件需要配置正确的 MIME-type，即 "text/cache-manifest"。必须在 web 服务器上进行配置。
Manifest 文件
manifest 文件是简单的文本文件，它告知浏览器被缓存的内容（以及不缓存的内容）。
manifest 文件可分为三个部分：
CACHE MANIFEST - 在此标题下列出的文件将在首次下载后进行缓存
NETWORK - 在此标题下列出的文件需要与服务器的连接，且不会被缓存
FALLBACK - 在此标题下列出的文件规定当页面无法访问时的回退页面（比如 404 页面）
Manifest 使用总结：
HTML页面添加.appcache的文件后，PC端和手机端浏览器都可离线缓存文件
添加了.appcache的页面本身也会被缓存
如果修改时间戳文件，而没有修改.appcache的文件，则不可以更新浏览器缓存文件
HTML页面引入.appcache的文件后，只有修改.appcache的文件，才能更新缓存文件
有了 .appcache文件后，HTML时间戳文件是否失去了它原来的意义呢？
也许当IE的低版本去见马克思后，当所有浏览器都支持HTML5应用程序缓存后，HTML时间戳文件才可能退休，至少在目前，还是离不开平凡更新的时间戳文件。而使用.appcache文件来更新浏览器缓存，目前主要应用在移动终端。
以上就是HTML 5应用程序缓存使用总结的内容，更多相关内容请关注PHP中文网（www.php.cn）！
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
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
Unable to save changes to Photos app error in Windows 11
Mar 04, 2024 am 09:34 AM
If you encounter the Unable to save changes error while using the Photos app for image editing in Windows 11, this article will provide you with solutions. Unable to save changes. An error occurred while saving. Please try again later. This problem usually occurs due to incorrect permission settings, file corruption, or system failure. So, we’ve done some deep research and compiled some of the most effective troubleshooting steps to help you resolve this issue and ensure you can continue to use the Microsoft Photos app seamlessly on your Windows 11 device. Fix Unable to Save Changes to Photos App Error in Windows 11 Many users have been talking about Microsoft Photos app error on different forums
Learn how to use the Boundless Notes app on iPhone and iPad
Nov 18, 2023 pm 01:45 PM
What is Boundless Notes on iPhone? Like the iOS17 Diary app, Boundless Notes is a productivity app with tons of creative potential. It’s a great place to turn ideas into reality. You can schedule projects, brainstorm ideas, or create mood boards so you never run out of space to express your ideas. The app allows you to add photos, videos, audios, documents, PDFs, web links, stickers, and more anywhere on an unlimited canvas. Many of the tools in Boundless Notes (like brushes, shapes, and more) will be familiar to anyone who uses iWork apps like Keynote or Notes. Real-time collaboration with colleagues, teammates, and group project members is also easy because Freeform allows
How to view clipboard history on Mac
Sep 14, 2023 pm 12:09 PM
View macOS Clipboard History from Finder When you copy anything on your Mac (text, images, files, URLs, etc.), it goes to the Clipboard. Here's how to see what was last copied on your Mac. Go to Finder and click "Edit" in the menu bar. Click "Show Clipboard". This will open a window showing the contents of the macOS clipboard. Get Clipboard History Containing Multiple Items in Mac Of course, native Mac Clipboard History isn't the most versatile tool you can have. It only shows the last thing you copied, so if you want to copy multiple things at once and then paste them all together, you simply can't do that. However, if you are looking for
Photos cannot open this file because the format is not supported or the file is corrupted
Feb 22, 2024 am 09:49 AM
In Windows, the Photos app is a convenient way to view and manage photos and videos. Through this application, users can easily access their multimedia files without installing additional software. However, sometimes users may encounter some problems, such as encountering a "This file cannot be opened because the format is not supported" error message when using the Photos app, or file corruption when trying to open photos or videos. This situation can be confusing and inconvenient for users, requiring some investigation and fixes to resolve the issues. Users see the following error when they try to open photos or videos on the Photos app. Sorry, Photos cannot open this file because the format is not currently supported, or the file
How to solve application startup error 0xc000012d problem
Jan 02, 2024 pm 12:53 PM
When a friend's computer is missing certain files, the application cannot start normally with error code 0xc000012d. In fact, it can be solved by re-downloading the files and installing them. The application cannot start normally 0xc000012d: 1. First, the user needs to download ".netframework". 2. Then find the download address and download it to your computer. 3. Then double-click on the desktop to start running. 4. After the installation is completed, return to the wrong program location and open the program again.
MS Paint not working properly in Windows 11
Mar 09, 2024 am 09:52 AM
Microsoft Paint not working in Windows 11/10? Well, this seems to be a common problem and we have some great solutions to fix it. Users have been complaining that when trying to use MSPaint, it doesn't work or open. Scrollbars in the app don't work, paste icons don't show up, crashes, etc. Luckily, we've collected some of the most effective troubleshooting methods to help you resolve issues with Microsoft Paint app. Why doesn't Microsoft Paint work? Some possible reasons why MSPaint is not working on Windows 11/10 PC are as follows: The security identifier is corrupted. hung system
How to connect Apple Vision Pro to PC
Apr 08, 2024 pm 09:01 PM
The Apple Vision Pro headset is not natively compatible with computers, so you must configure it to connect to a Windows computer. Since its launch, Apple Vision Pro has been a hit, and with its cutting-edge features and extensive operability, it's easy to see why. Although you can make some adjustments to it to suit your PC, and its functionality depends heavily on AppleOS, so its functionality will be limited. How do I connect AppleVisionPro to my computer? 1. Verify system requirements You need the latest version of Windows 11 (Custom PCs and Surface devices are not supported) Support 64-bit 2GHZ or faster fast processor High-performance GPU, most
Fix caa90019 Microsoft Teams error
Feb 19, 2024 pm 02:30 PM
Many users have been complaining about encountering error code caa90019 every time they try to log in using Microsoft Teams. Even though this is a convenient communication app, this mistake is very common. Fix Microsoft Teams Error: caa90019 In this case, the error message displayed by the system is: "Sorry, we are currently experiencing a problem." We have prepared a list of ultimate solutions that will help you resolve Microsoft Teams error caa90019. Preliminary steps Run as administrator Clear Microsoft Teams application cache Delete settings.json file Clear Microsoft from Credential Manager
