Lazy loading of vue routing and lazy loading of components--two implementation methods

1. Why use lazy loading of routes

In order to give customers a better customer experience, the first screen component loads faster and solves the white screen problem .

Lazy loading can divide the page and load the page when needed, which can effectively share the loading pressure on the homepage and reduce the loading time of the homepage .

2. Definition

Lazy loading is simply lazy loading or on-demand loading , that is, loading when needed .

Three, use

There are two commonly used lazy loading methods: using vue asynchronous components and import in ES

1. Without lazy loading, the routing code in vue is as follows

　　　　　　　 import Vue from 'vue'
                import Router from 'vue-router'
                import HelloWorld from '@/components/HelloWorld'
 
                Vue.use(Router)
 
                export default new Router({
                  routes: [
                    {
                      path: '/',
                      name: 'HelloWorld',
                      component:HelloWorld
                    }
                  ]
                })

2. Vue asynchronous components implement lazy loading

The method is as follows: component: resolve=>(require(['the address of the route that needs to be loaded']), resolve)

import Vue from 'vue'
import Router from 'vue-router'
　　/* 此处省去之前导入的HelloWorld模块 */
Vue.use(Router)
 
export default new Router({
  routes: [
    {
      path: '/',
      name: 'HelloWorld',
      component: resolve=>(require(["@/components/HelloWorld"],resolve))
    }
  ]
})

3. The import method proposed by ES, ( ------ most commonly used------)

The method is as follows: const HelloWorld = () =>import('The address of the module that needs to be loaded')

(Without { }, it means direct return)

import Vue from 'vue'
import Router from 'vue-router'
 
Vue.use(Router)
 
const HelloWorld = ()=>import("@/components/HelloWorld")
export default new Router({
  routes: [
    {
      path: '/',
      name: 'HelloWorld',
      component:HelloWorld
    }
  ]
})

4. Lazy loading of components

 Same as lazy loading of routes,

1. The writing method in the original component

<template>
  <div class="hello">
  <One-com></One-com>
  1111
  </div>
</template>
 
<script>
import One from './one'
export default {
  components:{
    "One-com":One
  },
  data () {
    return {
      msg: 'Welcome to Your Vue.js App'
    }
  }
}
</script>

2. const method

<template>
  <div class="hello">
  <One-com></One-com>
  1111
  </div>
</template>
 
<script>
const One = ()=>import("./one");
export default {
  components:{
    "One-com":One
  },
  data () {
    return {
      msg: 'Welcome to Your Vue.js App'
    }
  }
}
</script>

3. Asynchronous method

<template>
  <div class="hello">
  <One-com></One-com>
  1111
  </div>
</template>
 
<script>
export default {
  components:{
    "One-com":resolve=>require(['./one'],resolve)
  },
  data () {
    return {
      msg: 'Welcome to Your Vue.js App'
    }
  }
}
</script>