How to use the export default module exported in Vue

export default is a way to implement modular export in Vue.js. It packages a module into a whole, exposing an interface without specifying an export name to the outside, simplifying the import and use of modules. At the same time, it also avoids naming conflicts and improves the maintainability of the code.

The mystery of export default in Vue: a guide to exporting and using modules

Many Vue novices (even some veterans) are confused about export default and find it mysterious. In fact, the core of understanding it lies in understanding modularity and export mechanisms. This article will unveil its veil so that you no longer feel daunted by it. After reading it, you will not only be able to use export default , but also have a deeper understanding of Vue's modular design.

The meaning of modularity

In large projects, it is crucial to split the code into separate modules. This improves the maintainability, reusability and testability of the code. export default is a way to implement modular export in Vue. It allows a module to expose only one interface to the outside, which is simple and clear, and avoids naming conflicts.

How does export default work

Imagine you wrote a Vue component that contains the component's templates, data, methods, etc. export default is like an exit, it packages this component as a whole, and then you can use it elsewhere through import . It does not require specifying the export variable name like export , and it is more concise to use.

Code example: A simple component

 <code class="javascript">// MyComponent.vue export default { name: 'MyComponent', data() { return { message: 'Hello from MyComponent!' }; }, template: ` <div> <p>{{ message }}</p> </div> ` };</code>

In this example, the entire component object is exported by export default .

Use in other components

 <code class="javascript">// AnotherComponent.vue import MyComponent from './MyComponent.vue'; export default { name: 'AnotherComponent', components: { MyComponent }, template: ` <div> <mycomponent></mycomponent> </div> ` };</code>

Here, we imported MyComponent import MyComponent from './MyComponent.vue' . Note that because MyComponent.vue uses export default , we do not need to specify the specific export name, just use MyComponent directly.

Pros and cons of export default

Advantages: Concise and clear, only one interface is exported for a module to avoid naming conflicts.

Disadvantages: Since only one interface is exported, if a module needs to export multiple content, it needs to use export , which will reduce the readability of the code.

Advanced usage and potential problems

You may encounter situations where you need to export multiple content in one module. At this time, you can use export default and export in combination. For example:

 <code class="javascript">// utils.js export default { add: (a, b) => ab } export const subtract = (a, b) => a - b;</code>

Here, the add function is exported through export default , while the subtract function is exported through export .

Performance considerations

export default itself does not have a significant impact on performance. Performance bottlenecks usually come from the complexity of components and how data is processed, not the way they are exported.

Code style suggestions

Maintaining consistency in code style is crucial. If you already use export default in your project, stick to it, avoid mixing export and export default , and maintaining consistency in the code style.

Summarize

export default is a simple and powerful module export method in Vue. Understanding its principles and usage can enable you to better organize your code and improve development efficiency. Remember, choosing the right way to export depends on your project requirements and code style. Don’t be confused by the “simplicity” it seems, but understand the mechanism behind it so that you can be at ease in practical applications.

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