What is front-end lazy loading

Front-end lazy loading is an optimization strategy based on lazy loading technology. It is used to improve web page performance and user experience. It mainly targets images and other media resources in web pages through delayed loading or on-demand loading. to reduce initial page load time and network traffic. The implementation principle is to load only necessary resources when the page is first loaded, and delay loading or on-demand loading of other non-essential resources. For image resources, front-end lazy loading technology can place them near the visible area of ​​the page, or Load based on user scrolling behavior to reduce initial load time and network traffic.

The operating system for this tutorial: Windows 10 system, DELL G3 computer.

Front-end lazy loading is an optimization strategy based on lazy loading technology, which is used to improve web page performance and user experience. It mainly targets images and other media resources in web pages, using delayed loading or on-demand loading to reduce initial page loading time and network traffic.

The implementation principle of front-end lazy loading is to load only necessary resources when the page is first loaded, while other non-essential resources are delayed or loaded on demand. For image resources, front-end lazy loading technology can place them near the visible area of ​​the page, or load them based on the user's scrolling behavior to reduce initial loading time and network traffic.

The advantages of front-end lazy loading mainly include:

1. Reduce initial loading time: By lazily loading non-essential resources or loading them on demand, you can reduce the initial page loading time and improve the page loading time. responding speed.

2. Save network traffic: In front-end lazy loading mode, only the resources that users need to view will be loaded. This can significantly reduce unnecessary network traffic, thereby saving bandwidth and data transmission costs.

3. Improve user experience: Through technologies such as on-demand loading and lazy loading, front-end lazy loading can improve user experience, especially when network conditions are poor.

4. Optimize page resource management: Front-end lazy loading can optimize the management of page resources, making the loading of page resources more precise and flexible, thereby improving overall performance and response speed.

However, front-end lazy loading also has some shortcomings and areas that need attention:

1. Technical implementation complexity: The implementation of front-end lazy loading technology needs to take into account delayed loading, on-demand loading, etc. The technical details are relatively complex to implement.

2. Code maintainability: Front-end lazy loading technology may complicate the code structure and increase the difficulty of code maintenance.

3. User experience impact: Front-end lazy loading may cause the page to flicker or be temporarily blank, especially when the network condition is poor, which may affect the user experience.

4. Security and privacy risks: In front-end lazy loading mode, more user privacy data and security risks may be exposed, such as malicious script injection attacks. Therefore, additional considerations and safeguards for security are required.

In actual applications, you need to choose whether to use front-end lazy loading technology according to specific needs and situations. If the images and other media resources in the page are large or numerous, then front-end lazy loading technology can play a great advantage. However, if the page structure is relatively simple or the network condition is good, the advantages of front-end lazy loading technology may not be obvious. In addition, attention needs to be paid to technical implementation details and security issues to ensure the normal operation of the application and the privacy and security of users.

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