VUE3 development introductory tutorial: using Vue.js components to encapsulate complex functional components

Vue.js is a popular JavaScript framework that can be used to build single-page applications, responsive web interfaces, and complex front-end applications. The latest version of Vue.js, Vue3, brings many new features and performance improvements, making Vue.js an even better front-end framework.

This article will introduce how to use Vue.js components to encapsulate complex functional components. Let us use a practical example to illustrate.

Suppose we are developing an e-commerce website and we need to develop a product review system. This comment system should have the following functions:

1. Show comments
2. Post comments
3. Delete comments

In order to encapsulate these complex functions , we will create a comment component. Here are the steps to implement this component:

Step 1: Create a comment component

We will create a component in Vue.js and use the v-for directive to display all comments. The code is as follows:

<template>
  <div>
    <h2 id="评论">评论</h2>
    <ul>
      <li v-for="(comment, index) in comments" :key="index">
        {{ comment }}
        <button @click="deleteComment(index)">删除</button>
      </li>
    </ul>
    <form @submit.prevent="addComment">
      <input type="text" v-model="newComment" placeholder="请输入评论内容">
      <button type="submit">提交</button>
    </form>
  </div>
</template>
 
<script>
export default {
  data() {
    return {
      comments: [
        '这是一条评论',
        '这是另一条评论'
      ],
      newComment: ''
    }
  },
  methods: {
    addComment() {
      this.comments.push(this.newComment);
      this.newComment = '';
    },
    deleteComment(index) {
      this.comments.splice(index, 1);
    }
  }
}
</script>

In the above code, we define a comments array, which stores all comments. We also define a newComment variable, which represents the new comment we are adding. In the addComment method, we add the new comment to the comments array. In the deleteComment method, we use the splice function to delete the comment from the comments array.

Step 2: Use the review component in the main application

We can use this component in the application, for example, add it to the product details page. As shown below:

<template>
  <div>
    <h1 id="商品名称">商品名称</h1>
    <p>商品描述</p>
    <img src="/static/imghwm/default1.png"  data-src="商品图片url"  class="lazy" alt="商品图片">
 
    <Comment></Comment>
  </div>
</template>
 
<script>
import Comment from './Comment.vue'
 
export default {
  components: {
    Comment
  }
}
</script>

In the above code, we have added the Comment component as a subcomponent to the main application.

Now we have completed the development of the comment component. By encapsulating these complex functions, we can quickly create and reuse Vue.js components. It will be very easy to add custom styles to components, enhance interactivity and add other functionality.

In today's Vue3 tutorial, we learned how to use Vue.js components to encapsulate complex functional components. Vue.js’s componentized approach, along with popular toolchains such as the Vue CLI, have made Vue.js a widely adopted front-end framework. We hope this article has inspired developers who are currently or preparing to learn Vue.js and provided them with useful guidance to develop better applications.

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