VUE3 basic tutorial: implementing common functions

Vue3 is the latest version of Vue.js released recently. Vue3 provides many new features and optimizations, such as a new responsive system, better type support and performance improvements, making it more efficient and easier to use.

This article will introduce the basic tutorials for implementing common functions in Vue3. The following is the implementation of three basic functions:

1. Responsive data

Vue3 redesigns the responsive system and uses Proxy proxy objects to implement responsive data. Compared with Vue2's defineProperty, Proxy can recursively intercept property access of objects, and can better support arrays, dynamic addition/removal of properties, and non-enumeration properties.

In Vue3, you can create a Vue instance through the createApp function and use the reactive method to convert the data into responsive data.

Code example:

import { createApp, reactive } from 'vue'

const state = reactive({
  message: 'Hello Vue3!'
})

const app = createApp({
  template: `<div>{{ state.message }}</div>`,
  data() {
    return {
      state
    }
  }
})

app.mount('#app')

2. Component development

Component development in Vue3 has also been improved and provides more functions. Components can explicitly reference the properties and methods in the Parent component, and use the setup function to define the component's data and methods.

Code sample:

<template>
  <div>
    <h1>{{ title }}</h1>
    <button @click="increment">Increment</button>
    <p>Current count is: {{ count }}</p>
  </div>
</template>

<script>
import { ref, computed } from 'vue'

export default {
  props: {
    title: String
  },
  setup(props) {
    const count = ref(0)
    
    const increment = () => {
      count.value++
    }
    
    const displayCount = computed(() => {
      return `The count is currently ${count.value}`
    })
    
    return {
      count,
      increment,
      displayCount
    }
  }
}
</script>

3. Routing management

Vue Router is one of the most commonly used third-party libraries in Vue, used to manage routing in single-page applications. . In Vue3, Vue Router has also been improved and supports writing routing guards based on the Composition API.

Code sample:

import { createRouter, createWebHistory } from 'vue-router'
import Home from './views/Home.vue'
import About from './views/About.vue'

const routes = [
  {
    path: '/',
    name: 'home',
    component: Home
  },
  {
    path: '/about',
    name: 'about',
    component: About
  }
]

const router = createRouter({
  history: createWebHistory(),
  routes
})

router.beforeEach((to, from, next) => {
  if (to.matched.some(record => record.meta.requiresAuth)) {
    // check if user is authenticated
    if (!auth.isAuthenticated()) {
      next({
        name: 'login',
        query: { redirect: to.fullPath }
      })
    } else {
      next()
    }
  } else {
    next()
  }
})

export default router

To sum up, Vue3 provides many new features and improvements that can make development more efficient and easier to use. This article introduces the implementation of three basic functions, which can be used in combination in actual projects to improve development efficiency and user experience.

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