References and access methods of components in Vue documents

Vue is a JavaScript framework that can be used to build user interfaces. At the core of Vue is the component system, which allows you to break your UI into independent and reusable parts. This article will introduce the reference and access methods of components in Vue documents.

Vue components are reusable blocks of code that have their own templates, JavaScript logic and styles. Vue components can accept properties and events, and provide options such as lifecycle hooks.

In Vue, there are two ways to create components: global registration and local registration. Global registration allows you to use a component throughout your application, while local registration only allows a component to be used within its parent component.

Global registration of components:

In Vue, you can use the Vue.component() method to register components globally. This method accepts two parameters: the component name and the component options object. Here is a simple example:

Vue.component('my-component', {
  template: '<div>这是我的组件</div>'
})

The above code defines a component named "my-component" and specifies its template. Now, this component can be used in any Vue instance in the project.

Local registration of components:

In Vue, you can register components locally using the components option. This option is defined in the Vue instance or component. Here is a simple example:

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

The above code defines a component named "my-component" and registers it locally in the Vue instance using the components option. Components are now only available within the root element of a Vue instance (#app).

Access methods of components:

To use a component, you must reference it in a Vue instance or the template of another component. In a template, you can use the component name as the tag name for custom elements. For example, if you have a component called "my-component", you can use the following code in your template:

<my-component></my-component>

Vue will automatically replace my-component with the component's template and use the component options and attributes to populate it.

Inside a component, you can access the parent Vue instance using this.$parent or this.$root. Additionally, you can use props and event options in component options to pass data and events.

The props option allows you to pass data to the component. In the component, these properties can be accessed through this.propName. The following is a simple example:

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

In this example, the "my-component" component defines a property "message" of type string. In a component, you can use template binding to insert this property into the component's template.

<my-component message="Hello World"></my-component>

In this example, we pass the "Hello World" string as the message attribute of the component. In the component, Vue will bind this property to the corresponding template and display it in the result.

The event option allows you to send events to the component. When a component fires events, other components or Vue instances can capture these events and react accordingly. The following is a simple example:

Vue.component('my-component', {
  template: '<button v-on:click="onClick">Click me</button>',
  methods: {
    onClick: function () {
      this.$emit('my-event')
    }
  }
})

var vm = new Vue({
  el: '#app',
  methods: {
    onMyEvent: function () {
      alert('My event was triggered in parent component')
    }
  }
})

In this example, the "my-component" component defines a click event and uses the this.$emit() method to trigger an event named "my-event" Custom events. Then, in the Vue instance, you can use the v-on directive to capture the custom event and trigger a callback function.

<my-component v-on:my-event="onMyEvent"></my-component>

In this example, we pass a method name called "onMyEvent", which is called when the component triggers the "my-event" event.

Conclusion:

Components are one of the core parts of Vue applications, which make it easy to build reusable and extensible user interfaces. In the Vue document, component reference and access methods include global and local registration, props options and event options. Understanding and mastering these technologies can make it easier for you to build Vue applications.

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