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> <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>
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：
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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