js changed to vue

In modern front-end development, JavaScript (JS for short) has always been one of the main programming languages. However, over the long term, as web applications become larger and more complex, native JavaScript development can become difficult to maintain. Therefore, based on the improvement of development efficiency and code quality requirements, the use of advanced JavaScript frameworks has become a trend, and Vue.js is undoubtedly the best among them.

Vue.js is a JavaScript library for building user interfaces. Compared with other frameworks, Vue is lightweight, easy to learn and use, and progressive. In Vue, applications can be split into independent components to improve code reusability and maintainability. Vue has been widely used in many websites and applications and has become one of the first choices for front-end developers.

So, if we want to use Vue to improve JavaScript applications, what work needs to be done?

1. Introducing Vue.js

First, we need to introduce the Vue.js library into the application. Vue can be downloaded, introduced and managed by introducing it into an HTML file, or through a package management tool such as npm or yarn.

Introduce Vue into the HTML file:

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

Use npm or yarn to install and introduce Vue:

npm install vue

or

yarn add vue

2. Refactor the application Procedure

Before moving an application to Vue, the application needs to be analyzed to determine which parts can be abstracted into components and split into smaller components. When an application is broken into several components, each component can be written using Vue's Single File Components (SFC). SFC combines templates, JavaScript and CSS so that each component is completed in one file, making it easy to read and maintain.

For example, the JavaScript file "main.js" can be converted into a Vue component "App.vue":

// main.js
import Vue from 'vue';
import App from './App.vue';

new Vue({
  el: '#app',
  render: h => h(App)
});

// App.vue
<template>
  <div id="app">
    <header>
      <h1>{{ title }}</h1>
    </header>
    <main>
      <p>Hello, World!</p>
    </main>
  </div>
</template>

<script>
export default {
  name: 'App',
  data () {
    return {
      title: 'My App'
    };
  }
};
</script>

<style scoped>
header {
  background-color: #fff;
  color: #333;
}
</style>

3. Data binding

In In Vue, data-driven views. The state of a component is stored in the Vue instance's data, and other parts of the application bind it to the component with the corresponding state. When the data changes, the view updates accordingly.

For example, in a Vue component, you can use the "v-model" directive to bind form elements to component data:

<template>
  <div>
    <input v-model="message" type="text">
    {{ message }}
  </div>
</template>

<script>
export default {
  data () {
    return {
      message: ''
    };
  }
};
</script>

4. View Control

In Vue, you can use methods and calculated properties to control views. A method is a simple function that takes input and returns output. Computed properties are values ​​built based on a component's data state. Both can be used to control the view, but you should choose based on your needs.

For example, in a Vue component, you can use methods to change the component data when the button is clicked:

<template>
  <div>
    <button @click="addCount">Add</button>
    <p>Count: {{ count }}</p>
  </div>
</template>

<script>
export default {
  data () {
    return {
      count: 0
    };
  },
  methods: {
    addCount () {
      this.count++;
    }
  }
};
</script>

Alternatively, you can use computed properties to update the view when the component data changes:

<template>
  <div>
    <p>Count: {{ count }}</p>
    <p>Doubled: {{ doubled }}</p>
  </div>
</template>

<script>
export default {
  data () {
    return {
      count: 0
    };
  },
  computed: {
    doubled () {
      return this.count * 2;
    }
  }
};
</script>

Summary:

Vue provides a convenient way to improve JavaScript applications. Learning Vue can help us better organize code and improve the maintainability and scalability of applications. When converting your application, you need to rethink your application's architecture, split it into separate components, and optimize it using Vue's features like data binding, view controls, components, and more. While this takes time and effort, the end result will be a more robust and reliable JavaScript application.

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