Vue development experience sharing: how to handle rendering and optimization of large amounts of data

Vue development experience sharing: How to handle the rendering and optimization of large amounts of data

With the rapid development of Internet technology, the increasing amount of data has become a Frequently Asked Questions. In front-end development, using the Vue framework to build web applications has become a common choice. However, when we face large amounts of data, Vue's rendering performance may be affected, leading to application performance degradation. This article will share some experience in handling large data volume rendering and optimization, hoping to be helpful to Vue developers.

1. Use virtual list (Virtual List)

Virtual list is an optimization technology that greatly improves performance by rendering only the data items in the visible area instead of rendering them all. Improve rendering performance. The Vue community already has some mature virtual list plug-ins to choose from, such as vue-virtual-scroll-list and vue-virtual-scroll. These plug-ins can help us render large data lists efficiently and reduce memory usage and DOM operations.

2. Use paging loading (Pagination)

When the amount of data is too large, loading all the data to the front end at once may cause the page to load too slowly. In order to solve this problem, we can adopt a paging loading strategy and only load the data of the current page each time. By loading in pages, you can not only improve the loading speed of the page, but also reduce the memory usage and optimize the user experience.

3. Use Lazy Loading

For large amounts of images or other resources, loading them all at once will not only increase the page loading time, but also Takes up a lot of network bandwidth and memory. Therefore, you can consider using lazy loading to only load images in the visible area when the user scrolls the page. In Vue, you can use plug-ins such as vue-lazyload to implement the lazy loading function.

4. Optimize computed properties and dependency tracking

Vue’s computed properties are very convenient and can dynamically generate responsive results based on changes in data. However, in the case of large data volumes, the performance of computed properties may degrade. In order to optimize the performance of computed properties, we can consider using caching or other techniques to avoid unnecessary calculations.

In addition, Vue’s dependency tracking system (Dependency Tracking System) is the core of its responsive principle. When dealing with large data volumes, we need to pay special attention to the performance of the dependency tracking system. Unnecessary dependency collection and triggering can be reduced by properly designing the data structure and rationally using computed properties and watchers.

5. Use component-based development

Vue’s component-based development is one of its excellent features. When dealing with large data volumes, we can further optimize performance by splitting large lists into multiple sub-components to reduce unnecessary rendering and updates. Subcomponents can manage their own data status independently and only render the parts that need to be updated, thus improving performance.

6. Use v-show instead of v-if

The v-if instruction in Vue can switch the display and display of DOM elements based on the true or false value of the expression that meets the condition. hide. The v-show instruction simply controls the display and hiding of DOM elements and does not destroy and create frequently. When dealing with large amounts of data, frequent use of v-if to control the display and hiding of list items will cause performance degradation. Therefore, you can consider using v-show to improve rendering performance.

Summary:

When dealing with rendering and optimization of large amounts of data, we can comprehensively apply the above experience and techniques. According to specific scenarios and needs, flexibly choose the appropriate method and combine it with Vue's excellent features to improve application performance and provide a good user experience.

Reference:

1. vue-virtual-scroll-list: https://github.com/tangbc/vue-virtual-scroll-list
2. vue -virtual-scroll：https://github.com/Akryum/vue-virtual-scroll
3. vue-lazyload：https://github.com/hilongjw/vue-lazyload

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