Will Vue get stuck when writing large-scale projects?

Preface

Vue is a very popular framework in the front-end industry. Its lightweight, easy-to-use and flexibility are deeply loved by developers. But for large projects, some people may be worried about Vue's performance issues, or even feel that Vue will get stuck. So is this worry necessary? Next, I will share some of my experience and understanding to answer this question.

Vue's performance

First of all, we need to make it clear that Vue is a whole composed of progressive frameworks. This framework is very flexible and can be easily applied to a variety of different projects. Vue does not sacrifice other functions and flexibility for performance like some traditional frameworks. If Vue's performance is stuck, it's probably because we don't use it according to Vue's best practices.

Secondly, Vue has a very effective optimization mechanism to improve performance and stability. This set of mechanisms includes asynchronous rendering, virtual DOM, static node optimization, list rendering optimization, etc. These optimization methods are designed for performance issues that arise in actual projects, and Vue is constantly updated and optimized to ensure that it always remains in the optimal state.

Finally, we need to realize that Vue will not make our project "stuck" unless there is a problem with our own code. Performance problems of Vue usually come from the following aspects:

1. Rendering a large amount of data

When we need to render a large amount of data, if appropriate optimization methods are not used, there will be This may cause the page to freeze. Vue provides the v-for instruction for list rendering, but if the number of lists is very large, you need to consider using methods such as virtual scrolling or paging to avoid rendering a large number of DOM elements.

2. Multi-layer nested components

When Vue's component tree is very deep, all components need to be re-rendered every time the data changes. This re-rendering is very performance intensive. Therefore, we should avoid multi-layer nested components, especially nested components in "large single-page applications", and abstract reusable components as much as possible.

3. Frequent data monitoring

Vue’s responsive data two-way binding is one of its powerful features, but this feature requires monitoring data changes, thus consuming performance. If our business situation does not require real-time monitoring of data changes, we can consider turning off unnecessary data monitoring.

How to optimize the performance of Vue

Of course, we don’t need to worry about the performance of Vue. On the contrary, as long as we follow Vue's best practices, we can use it to build high-performance, stable applications. Here are several practical methods to optimize the performance of Vue:

1. Reasonable use of computed properties

Vue’s computed properties are a caching mechanism to avoid The same data is calculated repeatedly when rendering. Therefore, we should use computed properties reasonably, especially in large projects. Computed properties should be used to calculate time-consuming data to avoid performance problems caused by repeated calculations.

2. Avoid using v-if and v-for at the same time

When v-if and v-for are used at the same time, it will cause complexity related to rendering logic, so You should try to avoid using them both on the same DOM element. If you need to perform complex logic rendering, you can use the computed attribute or render function instead of v-for.

3. Precompiled components

Vue single file components (.vue) will be compiled into rendering functions and cached in memory. Therefore, we can improve the rendering speed of the page by precompiling components. Vue provides the vue-template-compiler tool to compile single-file components.

4. Lazy loading of components

In large projects, a very large number of components are used. If all components are loaded into memory at the beginning, performance will be affected. burden on. Therefore, we can use lazy loading to achieve on-demand loading. Vue provides the function of asynchronous components, which can load components when needed.

5. Use keep-alive caching components

When components are frequently switched, the overhead is not small. Vue provides the keep-alive component to cache component instances. When components switch, the cached component instance will be used directly to avoid the cost of re-rendering.

Summary

To sum up, Vue will not make our project laggy. It provides a series of optimization methods. We only need to develop according to Vue’s best practices. You can build high-performance and stable applications. At the same time, we also need to realize that optimization is a continuous process, and we need to continuously adjust and optimize to cope with different business scenarios and data scales.

Therefore, learning Vue well not only means mastering its API and syntax, but more importantly, understanding its design concepts and optimization mechanisms to build better web applications.

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