How to use Vue.extend extension component in Vue

How to use Vue.extend extension component in Vue

Vue is a very popular JavaScript framework, mainly used for building single-page applications. In Vue, components are the basic units for building user interfaces. Vue provides many built-in components, such as buttons, input boxes, drop-down menus, etc., but in some cases, you need to customize a component to meet your needs. Vue.extend is a way to extend components.

Vue.extend is an API provided by Vue, which is used to extend a Vue instance to create a new component. Components created through Vue.extend can inherit the options and methods of the parent component, and can add their own options and methods.

The following is a simple example that demonstrates how to use Vue.extend to create a component:

// 定义一个父组件
var Parent = Vue.extend({
  template: '<div><h2 id="我是父组件">我是父组件</h2><slot></slot></div>'
});

// 定义一个子组件
var Child = Parent.extend({
  template: '<div><h3 id="我是子组件">我是子组件</h3></div>'
});

// 注册子组件
Vue.component('child', Child);

In the above example, a parent component is first created, which contains a slot (slot ) is used to receive the content of the child component. Then a child component was created via Vue.extend and the template options were overridden in the child component. Finally, use Vue.component to register the subcomponent into the Vue instance.

Using subcomponents in parent components can be like this:

<template>
  <div>
    <child>
      <p>我是插入到父组件中的内容</p>
    </child>
  </div>
</template>

In the above example, the subcomponent is inserted into the parent component and a piece of text is passed to the insert in the subcomponent. in the trough.

In addition to inheriting the options and methods of the parent component, you can also add your own options and methods in the child component. For example, you can add a data option to the child component:

var Child = Parent.extend({
  template: '<div><h3 id="我是子组件">我是子组件</h3></div>',
  data: function() {
    return {
      message: '这是子组件的数据'
    }
  }
});

In the above example, a data option is added to the child component, which returns an object containing the message attribute, which is used to save the child component. The component's data.

Custom components are one of the powerful features of Vue. Vue.extend provides developers with the flexibility and convenience to create custom components. By extending existing components, Vue applications can be written more efficiently, improving code reusability and maintainability.

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