Steps and considerations for using the Vue.extend function to create local components

Steps and considerations for creating partial components using the Vue.extend function

In Vue.js, components are an important part of building an application. By splitting the application into components, we can improve code reusability and maintainability. Vue provides a Vue.extend function that can be used to create local components for use in your application.

Below, we will follow the steps below to demonstrate how to use the Vue.extend function to create a local component and introduce some things to pay attention to.

1. Import Vue library
   First, import the Vue library in the code so that the Vue.extend function can be used. It can be introduced through a CDN link or using npm to install the Vue library.

<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>

2. Create a Vue instance
   Next, create a Vue instance and specify the elements to be mounted.

<div id="app"></div>

<script>
  new Vue({
    el: '#app'
  });
</script>

3. Use Vue.extend function to create components
   Use Vue.extend function to create components, and pass the component options as parameters into the Vue.extend function.

<script>
  var MyComponent = Vue.extend({
    template: '<p>This is my component!</p>'
  });
</script>

4. Register component
   Register the component to the Vue instance so that the component can be used in the application.

<script>
  new Vue({
    el: '#app',
    components: {
      'my-component': MyComponent
    }
  });
</script>

5. Using components in templates
   In templates in Vue instances, components are referenced and used by using their name, which is the name specified when the component was registered.

<div id="app">
  <my-component></my-component>
</div>

6. Complete code example

<div id="app">
  <my-component></my-component>
</div>

<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
<script>
  var MyComponent = Vue.extend({
    template: '<p>This is my component!</p>'
  });

  new Vue({
    el: '#app',
    components: {
      'my-component': MyComponent
    }
  });
</script>

Note:

1. Vue.extend function is used to create local components , rather than global components. Local components are only available within the Vue instance in which they are created.
2. Component names should be in lowercase letters, with underscores separating words. When registering a component, the name needs to use camelCase.
3. The component's template can be a string template or a DOM element with a specific id attribute. Vue will automatically compile the template and insert the component's content into the specified element.
4. Component options can include attributes such as data, methods, computed, and watch, which are used for component data and behavior management.
5. When using a component in a template, you need to surround the component with a wrapping tag, just like the div tag used in the example above.

Use the Vue.extend function to easily create partial components and use them in Vue applications. Through the rational use of components, the code can be modularized and the reusability and maintainability of the code can be improved. I hope the above steps and notes will be helpful for you to understand and learn how to use the Vue.extend function to create partial components.

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