Vue中如何引用公共方法和公共组件

import AreaSelect from '@/components/AreaSelect'
Vue.use(AreaSelect) // 引用自定义组件
Vue.component('area-select', AreaSelect) // 初始化组件
new Vue({
  el: '#app',
  components: {
    AreaSelect
  },
})

<template>
  <el-card>
    <div class="page-tools">
      <div class="left">
        <div class="tips">
          <i class="el-icon-info" />
          <span>
            <!-- 具名插槽 -->
            <slot name="left">文字区域</slot>
          </span>
        </div>
      </div>
      <!-- 右侧 -->
      <div class="right">
        <!-- 具名插槽 -->
        <slot name="right" />
      </div>
    </div>
  </el-card>
</template>
<script>
export default {}
</script>
<style lang="scss" scoped>
.page-tools {
  display: flex;
  justify-content: space-between;
  align-items: center;
  .tips {
    line-height: 34px;
    padding: 0px 15px;
    border-radius: 5px;
    border: 1px solid rgba(145, 213, 255, 1);
    background: rgba(230, 247, 255, 1);
    i {
      margin-right: 10px;
      color: #409eff;
    }
  }
}
</style>

<template>
  <div class="department-container">
    <div class="app-container">
      <page-tool>
        <template #left>
          总记录数：20条
        </template>
        <template #right>
          <el-button type="warning">导入excel</el-button>
          <el-button type="danger">导出excel</el-button>
          <el-button type="primary">新增员工</el-button>
        </template>
      </page-tool>
      <el-card>
        <!-- 具体页面结构 -->
        员工管理
      </el-card>
    </div>
  </div>
</template>
<script>
import PageTool from '@/components/employes'
export default {
  components: {
    PageTool
  }
}
</script>

// 导入全局组件(公共组件)
import PageTool from '@/components/employes'
Vue.component(`PageTool`, PageTool)