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>
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！