问题:Vue初学,自定义的ComponentAside组件在页面引用后无法显示并报错。但组件的代码直接放到页面里是可以正常显示的。
报错信息
```javascript
vue.runtime.esm.js?c320:4560 [Vue warn]: Unknown custom element: <common-aside> - did you register the component correctly? For recursive components, make sure to provide the "name" option.
found in
---> <HomePge> at views/HomePge.vue
<HelloWorld> at src/components/HelloWorld.vue
<App>
<Root>
组件ComponentAside代码
<template>
<el-menu default-active="1-4-1" class="el-menu-vertical-demo" @open="handleOpen" @close="handleClose" :collapse="isCollapse">
<el-submenu index="1">
<template slot="title">
<i class="el-icon-location"></i>
<span slot="title">导航一</span>
</template>
<el-menu-item-group>
<span slot="title">分组一</span>
<el-menu-item index="1-1">选项1</el-menu-item>
<el-menu-item index="1-2">选项2</el-menu-item>
</el-menu-item-group>
<el-menu-item-group title="分组2">
<el-menu-item index="1-3">选项3</el-menu-item>
</el-menu-item-group>
<el-submenu index="1-4">
<span slot="title">选项4</span>
<el-menu-item index="1-4-1">选项1</el-menu-item>
</el-submenu>
</el-submenu>
<el-menu-item index="2">
<i class="el-icon-menu"></i>
<span slot="title">导航二</span>
</el-menu-item>
<el-menu-item index="3" disabled>
<i class="el-icon-document"></i>
<span slot="title">导航三</span>
</el-menu-item>
<el-menu-item index="4">
<i class="el-icon-setting"></i>
<span slot="title">导航四</span>
</el-menu-item>
</el-menu>
</template>
<style>
.el-menu-vertical-demo:not(.el-menu--collapse) {
width: 200px;
min-height: 400px;
}
</style>
<script>
export default {
data() {
return {
isCollapse: true
};
},
methods: {
handleOpen(key, keyPath) {
console.log(key, keyPath);
},
handleClose(key, keyPath) {
console.log(key, keyPath);
}
}
}
</script>
组件HelloWorld代码
<template>
<div id="hello">
<router-view>
</router-view>
</div>
</template>
<script>
export default {
name: 'HelloWorld',
props: {
msg: String
}
}
</script>
<style scoped>
h3 {
margin: 40px 0 0;
}
ul {
list-style-type: none;
padding: 0;
}
li {
display: inline-block;
margin: 0 10px;
}
a {
color: #42b983;
}
</style>
页面HomePage代码
<template>
<el-container >
<el-aside with="auto">
<common-aside></common-aside>
</el-aside>
<el-container>
<el-header>Header</el-header>
<el-main>Main</el-main>
</el-container>
</el-container>
</template>
<script>
import CommonAside from '../src/components/CommonAside.vue'
export default
{
name:'HomePage',
components:
{
CommonAside
},
data (){return {}}
}
</script>
<script lang="less" scoped>
.el-header
{
background-color:#333
}
.el-main
{
}
</script>
```