1.登录成功之后存储 用户信息

        在store里面添加代码

  SET_USERINFO: (state, userInfo) => {
            sessionStorage.setItem("userInfo", JSON.stringify(userInfo))
        },



 GET_USERINFO: state => {
            return JSON.parse(sessionStorage.getItem("userInfo"))
        }

2.LoginVue里面添加代码

        成功之后 存储用户信息

store.commit('SET_USERINFO',currentUser);

3.header里面添加布局

        header里面新建Vue

        添加两个组件一个是面包屑 面包屑在左侧 一个是头像显示 再右侧

面包屑：

<template>
  <div class="navbar">
    <Breadcrumb/>
    <div class="navbar-right">
      <Avatar/>
    </div>
  </div>
</template>

<script setup>
import Breadcrumb from './components/breadcrumb.vue'
import Avatar from './components/avatar.vue'
</script>

<style lang="scss" scoped>
.navbar {
  width: 100%;
  height: 60px;
  overflow: hidden;
  background-color: #F5F5F5;
  box-shadow: 0 1px 4px rgba(0, 21, 41, 0.08);
  padding: 0 16px;
  display: flex;
  align-items: center;
  box-sizing: border-box;
  position: relative;
  .navbar-right {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    :deep(.navbar-item) {
      display: inline-block;
      margin-left: 18px;
      font-size: 22px;
      color: #5a5e66;
      box-sizing: border-box;
      cursor: pointer;
    }
  }
}
</style>

4.面包屑代码  之后的 动态面包屑会具体实现这里

<template>
面包屑
</template>

<script setup>

</script>

<style lang="scss" scoped>

</style>

5.头像显示

        这块代码 主要是const squareUrl=ref(getServerUrl()+'image/userAvatar/'+currentUser.value.avatar)

        这里是后端写好 然后请求接口 获取到这个头像 

        同时这里有登出功能

<template>
 <el-dropdown>
    <span class="el-dropdown-link">
      <el-avatar shape="square" :size="40" :src="squareUrl" />
      &nbsp;&nbsp;{{ currentUser.username }}
      <el-icon class="el-icon--right">
        <arrow-down />
      </el-icon>
    </span>
    <template #dropdown>
      <el-dropdown-menu>
        <el-dropdown-item>个人中心</el-dropdown-item>
        <el-dropdown-item @click="logout">安全退出</el-dropdown-item>
      </el-dropdown-menu>
    </template>
  </el-dropdown>
</template>

<script setup>
import { ArrowDown } from '@element-plus/icons-vue'
import {ref} from 'vue'
import store from '@/store'
import requestUtil,{getServerUrl} from '@/util/request'

const currentUser=ref(store.getters.GET_USERINFO);

const squareUrl=ref(getServerUrl()+'image/userAvatar/'+currentUser.value.avatar)

const logout=async ()=>{
  let result=await requestUtil.get("/logout");

  if(result.data.code===200){
    store.dispatch('logout')
  }
}

</script>

<style lang="scss" scoped>
.el-dropdown-link {
  cursor: pointer;
  color: var(--el-color-primary);
  display: flex;
  align-items: center;
}
</style>

    actions: {
        logout() {
            window.sessionStorage.clear();
            router.replace("/login")
        }
    },

        登出再store的 Actions里面添加