vue同步父子组件和异步父子组件的生命周期顺序问题

时间:2020-05-16 不是laumlin 人气:0

关于vue组件的引入方式有两种

一、同步引入

例子： import Page from '@/components/page'

二、异步引入

例子：const Page = () => import('@/components/page')

或者： const Page = resolve => require(['@/components/page'], page)

两种引入方式的不同之处在于：

同步引入时生命周期顺序为：父组件的beforeMount、created、beforeMount --> 所有子组件的beforeMount、created、beforeMount --> 所有子组件的mounted --> 父组件的mounted

例子：

<! -- App.vue -->
<template>
 <div id="app">
  <New /> <!-- 子组件一 -->
  <Page /> <!-- 子组件二 -->
  <router-view/>
 </div>
</template>
<script>
import Page from '@/components/page' // 同步方式引入
import New from '@/components/new'
export default {
 name: 'App',
 components: {
  Page,
  New
 },
 beforeCreate () {
  console.log('父组件App -------> App beforeCreate')
 },
 created () {
  console.log('父组件App -------> App created')
 },
 mounted () {
  console.log('父组件App -------> App mounted')
 },
 beforeMount () {
  console.log('父组件App -------> App beforeMount')
 }
}
</script>
</script>

<!-- new.vue -->
<template>
 <div>
 <p>this is a new component</p>
 </div>
</template>

<script>
export default {
 name: 'new',
 created () {
  console.log('子组件new ----> new created')
 },
 beforeCreate () {
  console.log('子组件new ----> new beforeCreate')
 },
 mounted () {
  console.log('子组件new ----> new mounted')
 },
 beforeMount () {
  console.log('子组件new ----> new beforeMount')
 }
}
</script>

<!-- page.vue-->
<template>
 <div>
 <Job />
 <p>this is a page component</p>
 </div>
</template>

<script>
import Job from '@/components/job'
export default {
 name: 'page',
 components: {
 Job,
 },
 beforeCreate () {
 console.log('子组件page ----> page beforeCreate')
 },
 created () {
 console.log('子组件page ----> page created')
 },
 mounted () {
    console.log('子组件page ----> page mounted')
 },
 beforeMount () {
   console.log('子组件page ----> page beforeMount')
 }
}
</script>

<!-- job.vue -->
<template>
 <div>
 <p>this is a job component, in page.vue</p>
 </div>
</template>

<script>
export default {
 name: 'job',
 created () {
  console.log('孙组件job ------> job created')
 },
 beforeCreate () {
  console.log('孙组件job ------> job beforeCreate')
 },
 mounted () {
  console.log('孙组件job ------> job mounted')
 },
 beforeMount () {
  console.log('孙组件job ------> job beforeMount')
 }
}
</script>

在这里插入图片描述

异步引入时生命周期顺序：父组件的beforeCreate、created、beforeMount、mounted --> 子组件的beforeCreate、created、beforeMount、mounted

在上面的代码只需要修改引入的方式：

import Page from '@/components/page' // 同步方式引入
import New from '@/components/new'
import Job from '@/components/job'

改为：

const Page = () => import ('@/components/page') // 异步引入
const New = () => import ('@components/new')
const Job = () => import ('@/components/job'

结果：

在这里插入图片描述

总结

以上所述是小编给大家介绍的vue同步父子组件和异步父子组件的生命周期顺序问题，希望对大家有所帮助，如果大家有任何疑问欢迎给我留言，小编会及时回复大家的！

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