An article to understand the relevant knowledge points of Vue
Vue.js is a popular JavaScript framework for developing web applications. It is widely used to build Single Page Applications (SPA), complex web applications, and interactive user interfaces (UI).
The strength of Vue.js is its ease of use and excellent performance. Responsive data binding and componentized view templates make it easy to develop, while the underlying virtual DOM algorithm ensures excellent performance.
This article will introduce how to understand Vue.js, including how to install, create a basic Vue application, develop and debug Vue components, etc.
Install Vue.js
Vue.js can be used through npm or directly introduced to the relevant CDN. npm can install Vue through the following command:
npm install vue
When introducing CDN, just add the following content to the head part of the HTML file:
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
Create a simple Vue application
First, you need to create an HTML file to serve as a container for the Vue application. Next, import Vue.js and a main JavaScript file into this file. The main JavaScript file will contain the Vue instance along with the components, directives, routes, etc. required by the instance.
The following is a simple HTML file example:
<!DOCTYPE html>
<html lang="zh_CN">
<head>
<meta charset="UTF-8">
<title>认识Vue.js</title>
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
</head>
<body>
<div id="app">
{{ message }}
</div>
<script src="main.js"></script>
</body>
</html>Create a Vue instance in the main JavaScript file main.js:
var app = new Vue({
el: '#app',
data: {
message: 'Hello Vue!'
}
})Here, we change the el of the Vue instance Properties are set to the same as the container id, then the message property is defined and set to "Hello Vue!". Finally, we can get the value of the message attribute by wrapping it in a div using double curly braces.
Developing Vue Components
Vue components are the basic building blocks of Vue applications. A component can be a simple HTML tag or a complex nested structure. Each component requires a Vue instance to drive and can also include other components as well as state and behavior.
The following is a simple component example:
<template>
<div>
<h1>My First Vue Component</h1>
<p>{{ message }}</p>
<button @click="onClick">Click me</button>
</div>
</template>
<script>
export default {
name: 'MyComponent',
data () {
return {
message: 'Hello Vue from component!'
}
},
methods: {
onClick () {
console.log('Clicked!')
}
}
}
</script>In this sample code, we define a component named "MyComponent". The component uses the template tag to define its HTML structure, and the component-related data and methods are defined in the script tag. Here we define the message property message , then bind it to the view using double curly braces in the template, and add a click button event to print "Clicked!" to the console.
Finally, introduce the component in the main JavaScript file and register it in the application:
import Vue from 'vue'
import MyComponent from './MyComponent.vue'
Vue.component('my-component', MyComponent)
var app = new Vue({
el: '#app'
})Here, we first introduce MyComponent.vue through the import keyword and register it as my-component . We then apply the component to the root element #app by creating a new Vue instance.
Debugging a Vue.js application
When developing a Vue.js application, sometimes you need to understand the status of the application and view the rendering of each component. Vue DevTools is a great tool that provides rich debugging capabilities. To use Vue DevTools, you need to install it in your browser first.
After installation, you can use it to view the component tree, properties, and data flows in your Vue application, as well as inspect the component's performance and internal state. In the browser console, you can enter the following command to open Vue DevTools:
Vue.config.devtools = true
Summary
Vue.js is an excellent JavaScript framework that can help you build high-performance web applications . In terms of understanding Vue.js, this article introduces the installation of Vue.js, creating a simple Vue application, developing and debugging Vue components, etc. Hopefully this content will help you master Vue.js and use it to its fullest potential in practice.
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