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vue同步父子组件和异步父子组件的生命周期顺序问题

2019-11-19 12:47:12
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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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