The use of Vue.component function and how to create local components

Usage of Vue.component function and how to create partial components

Vue.js is a progressive JavaScript framework for building user interfaces. Not only does it provide many powerful features, it also helps us organize and manage our code better.

Vue.component is a very useful function in Vue.js, which can be used to create global components or local components. In this article, we will focus on how to create local components using the Vue.component function.

In Vue.js, components are reusable code blocks used to encapsulate HTML, CSS and JavaScript to implement specific functions. The Vue.component function is used to create Vue components. Let's look at an example:

// 创建一个名为 'my-component' 的全局组件
Vue.component('my-component', {
  template: '<div>这是我的组件</div>'
})

In the above example, we created a global component named 'my-component' through the Vue.component function. The component contains a simple div element containing the text "This is my component".

Global components are available throughout the entire Vue application. Just call Vue.component in the main Vue instance. However, global components are not always needed, especially for large projects.

Let us see an example of creating a local component:

var app = new Vue({
  el: '#app',
  components: {
    'my-component': {
      template: '<div>这是我的组件</div>'
    }
  }
})

In the above example, we created a local component named 'my-component' and added it to Vue In the component options of the instance. In this way, this component can be used in the DOM element whose el is '#app'.

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

The above is a simple HTML structure in which we use the 'my-component' component. This component will be rendered by the Vue instance into the DOM element with the id 'app'.

The benefit of partial components is that they can only be used inside the Vue instance in which they are defined, which avoids global naming conflicts and improves the maintainability and reusability of components.

In addition to basic HTML templates, we can also use partial components to pass data, listen to events, and share data between components. Let's look at a more complex example:

Vue.component('child-component', {
  props: ['message'],
  template: '<div>{{ message }}</div>'
})

var app = new Vue({
  el: '#app',
  data: {
    parentMessage: '这是父组件的消息'
  },
  template: `
    <div>
      <child-component :message="parentMessage"></child-component>
    </div>
  `
})

In the above example, we created a local component called 'child-component' and added a prop called 'message' to it Attributes. We also define a data property called 'parentMessage' and bind it to the 'message' property of the 'child-component' component.

<div id="app">
  <!-- 组件会渲染为：<div>这是父组件的消息</div> -->
  <child-component :message="parentMessage"></child-component>
</div>

In the HTML template of the parent component, we pass the data by using the 'child-component' component and passing the 'parentMessage' attribute as the value of the 'message' attribute. Finally, 'child-component' will be rendered as a div element and the parent component's message will be displayed.

By creating local components through the Vue.component function, we can better organize and manage our code, and improve the reusability and maintainability of the code. Whether creating simple components or complex components, Vue.component can meet our needs.

I hope this article will help you understand the use of Vue.component function and how to create partial components. I wish you a happy coding experience when using Vue.js!

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