How is the offline access capability of H5 and applets?

Both H5 and applets provide offline access capabilities, allowing users to use it without a network. H5 uses the caching mechanism, App Cache and Service Workers to achieve offline access; applets rely on applet packages, data caches and Worker threads to achieve. This feature enhances user experience, saves traffic, and improves accessibility, but has limitations such as limited cache space, inability to update in real time, and additional development efforts.

Offline access capabilities of H5 and applets

Straight to the point
Both H5 and applets have offline access capabilities, allowing users to access and interact without a network connection.

Expand in detail

H5's offline access capability

• Caching mechanism: H5 uses the cache mechanism to store website content (HTML, CSS, JavaScript, images, etc.) on the local device. When a user visits the website again, the browser will prioritize loading content from the cache, thereby enabling offline access.
• App Cache: App Cache is a W3C standard that allows H5 applications to cache specific resources for offline access. Unlike browser caching, App Cache can specify resources that need to be cached and control the update and cleaning of caches.
• Service Workers: Service Workers are background scripts in H5 that intercept network requests and cache responses. This allows H5 applications to achieve more flexible and powerful offline access capabilities.

Offline access capabilities of mini programs

• Mini Program Package: The mini program package contains all the code and resources of the mini program. When the user opens the applet for the first time, the applet package will be downloaded to the local device. Subsequently, the applet can run without a network connection.
• Data Caching: Mini programs can also cache data, such as user settings, form data, etc. When the user is offline, this data is still available to ensure the applet is running normally.
• Worker threads: applets can also use Worker threads to perform background tasks, such as data updates or preloading resources. Worker threads allow applets to continue execution while offline, thereby improving the offline access experience.

Advantages and limitations

Advantages:

• Improve user experience and access applications even when offline.
• Save traffic and reduce network consumption.
• Enhance accessibility and allow users to use applications in areas where networks are unstable or weak signals.

Limitations:

• The cache space is limited and everything may not be cached.
• The cached content cannot be updated in real time, and the latest information may not be available when offline.
• Additional development efforts are required to implement offline access.

The above is the detailed content of How is the offline access capability of H5 and applets?. For more information, please follow other related articles on the PHP Chinese website!