Explore some basic concepts and code structure of Vue

Vue is a progressive framework written in JavaScript and is often used to build single-page applications (SPA) and user interface components. Vue is designed to be an easy-to-learn and use framework because it uses some simple APIs and syntax, while also providing many advanced features, such as components, routing, state management, and more. In this article, we’ll dive into some of Vue’s basic concepts and code structure.

Structure and usage of Vue code

Vue’s code is basically divided into three parts: HTML template, JavaScript code and CSS style. These three parts are combined to form a complete Vue component for rendering different pages in a web application. Below, we will introduce the functions and code implementation of these three parts respectively.

HTML Template

Vue’s HTML template is used to describe how components are rendered. The {{}} statement in HTML is Vue's template syntax, which can insert variables, expressions, and call methods and calculated properties defined in Vue instances. HTML templates can use Vue-specific instructions to implement more advanced functions, such as event binding, loop display, conditional rendering, etc.

The following is a simple HTML template example:

<div id="app">
  <h1>{{ message }}</h1>
  <button v-on:click="incrementCounter">+1</button>
</div>

JavaScript code

Vue’s JavaScript code is usually composed of Vue instances and components. The Vue instance is the starting point of the Vue application. It contains various options and data of Vue, and also provides various life cycle hook functions for handling various stages of the component. Components are the basic building blocks of Vue applications. They are composed of templates, data and behaviors, and can be nested, reused and split to achieve more advanced UI functions.

The following is a simple Vue instance and component example:

// Vue实例
var vm = new Vue({
  el: '#app',
  data: {
    message: 'Hello Vue!',
    counter: 0
  },
  methods: {
    incrementCounter: function() {
      this.counter++
    }
  }
})

// 组件
Vue.component('my-component', {
  template: '<div>{{ message }}</div>',
  data: function() {
    return {
      message: 'Hello Component!'
    }
  }
})

CSS style

Vue’s CSS style is the same as ordinary CSS style, used to set components and pages Appearance and layout. Vue can use dynamic CSS classes and inline styles to achieve more advanced style effects, and can also use some CSS preprocessors and tools to simplify the writing of style code.

The following is a simple CSS style example:

#app {
  background-color: #fff;
  color: #333;
  font-family: Arial, sans-serif;
}

button {
  padding: 10px 20px;
  background-color: #0074d9;
  color: #fff;
  border: none;
  border-radius: 5px;
}

button:hover {
  background-color: #005cc5;
  cursor: pointer;
}

.my-component {
  font-size: 24px;
  color: #f00;
}

Summary

This article introduces the basic structure and usage of Vue's HTML templates, JavaScript code and CSS styles. Vue is a very flexible and powerful framework that can be used to build various types of web applications and component libraries. Understanding the code structure and usage of Vue is an important foundation for learning and using Vue.

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