What is the role of export default in vue

The purpose of export default in Vue: export components, such as MyComponent.vue, for code reuse and modularization. Export directives, such as myDirective.js, are used to enhance Vue component functionality. Export other JavaScript modules, such as dataModel.js, for exporting data models, utility functions, or services.

The role of export default in Vue

In Vue, the export default syntax is available For exporting components, directives or other JavaScript modules. It allows code to be exported from one file to another, enabling code reuse and modularization.

Export components

export default One of the most common uses is to export components. For example:

<code class="javascript">// MyComponent.vue
<template>
  <div>我是 MyComponent</div>
</template>
<script>
export default {
  name: "MyComponent",
};
</script></code>

This code will export a component named MyComponent, which can be used in other files:

<code class="javascript">// App.vue
<template>
  <MyComponent />
</template>
<script>
import MyComponent from "./MyComponent.vue";
</script></code>

Export directive

export default can also be used to export instructions. For example:

<code class="javascript">// myDirective.js
export default {
  bind(el, binding, vnode) {
    // 指令逻辑
  },
};</code>

This code will export a directive named myDirective, which can be used in Vue components:

<code class="javascript"><template>
  <div v-myDirective>我是带有指令的元素</div>
</template>
<script>
import myDirective from "./myDirective.js";
</script></code>

Export other JavaScript modules

export default can also be used to export other JavaScript modules, such as data models, utility functions, or services. For example:

<code class="javascript">// dataModel.js
export default {
  name: "John",
  age: 30,
};</code>

This code will export a JavaScript module named dataModel, which can be used in other files:

<code class="javascript">// App.js
import dataModel from "./dataModel.js";
console.log(dataModel.name); // 输出: "John"</code>

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