The key to making cross-platform H5 mobile applications is compatibility and performance optimization. 1. Select the appropriate development framework, such as Vue is suitable for small and medium-sized projects, React is more suitable for large projects, combined with Cordova or Capacitor to achieve a native experience; 2. Use flex rem, vw/vh or PostCSS plug-ins to solve adaptation problems, and deal with common problems such as high-definition screen borders, content overflow and horizontal and vertical screen switching; 3. Performance optimization includes image compression, CDN acceleration, caching strategy, reducing DOM operations and HTTP requests, and evaluate the optimization effect through Lighthouse tools; 4. To handle platform differences, you can use fastclick, Modernizr and other tool libraries, and add compatibility detection logic to adapt to different device styles and scripts.

The key to making cross-platform H5 mobile applications is compatibility and performance optimization. Although H5 applications are inherently cross-platform advantages, there are still many details that need to be paid attention to if they can run smoothly on different devices and browsers.

1. Choose the right development framework

The mainstream H5 development frameworks now include Vue, React, and their mobile adaptation solutions, such as Vue Vant and React Ant Design Mobile. If you want development efficiency and maintenance to be efficient, it is very important to choose a framework you are familiar with.

• Vue is suitable for small and medium-sized projects, quick to get started and mature in the ecosystem;
• React is more suitable for large projects and has a high degree of componentization;
• If you need a native experience, you can consider packaging it into a native application in combination with Cordova or Capacitor.

Note that when selecting frameworks, you should consider future maintenance and teamwork, and do not blindly pursue new frameworks.

2. Responsive layout and adaptation schemes

Different mobile phone screen sizes vary greatly, and the H5 page must be responsively laid out. The commonly used method is to use flex to layout rem units , dynamically set the font-size of html through JavaScript, and achieve equal-scale scaling.

You can also consider using the vw/vh unit of CSS, or automatically converting px to rem with the PostCSS plug-in. In this way, when writing styles, use familiar px, which is more efficient in development.

Frequently asked questions include:

• The 1px border is thick under the HD screen;
• Highly fixed but overflowing content;
• The layout is inconsistent when switching horizontal and vertical screens.

These problems can be solved through media query, rem adaptation, and dynamic setting of viewport.

3. Performance optimization is key

The performance of H5 applications directly affects the user experience, especially in environments with poor networks, pay more attention to optimization.

Common optimization methods include:

• Lazy image loading and compression;
• Static resources use CDN;
• Use caching strategies reasonably;
• Reduce DOM operations and redraw;
• Merge requests and reduce the number of HTTP requests.

In addition, it is recommended to use Chrome DevTools' Lighthouse tool to evaluate page performance and optimize targetedly based on ratings.

4. Address platform differences and compatibility issues

Although H5 is cross-platform, there are still many compatibility issues with different mobile browsers, such as:

• iOS input tag soft keyboard pop-up problem;
• click event delay on Android;
• WeChat browser and QQ browser do not fully support certain CSS attributes.

At this time, you can use some tool libraries, such as fastclick to solve click delay, or use Modernizr to detect browser features. Compatibility detection logic can also be added to the project to load different styles or scripts according to different devices.

Basically that's it. Cross-platform H5 application development is not complicated, but there are many details, especially in terms of adaptation and performance. As long as you plan the framework and adaptation plan in the early stage, the later maintenance will be much easier.

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