项目当前版本

{
  
  "dependencies": {
    "@element-plus/icons-vue": "^2.1.0",
    "@types/js-cookie": "^3.0.3",
    "@types/nprogress": "^0.2.0",
    "axios": "^1.4.0",
    "core-js": "^3.8.3",
    "element-plus": "^2.3.8",
    "js-cookie": "^3.0.5",
    "nprogress": "^0.2.0",
    "path-browserify": "^1.0.1",
    "svg-sprite-loader": "^6.0.11",
    "vue": "^3.2.13",
    "vue-router": "^4.0.3",
    "vuex": "^4.0.0"
  },
}

运行过程中，菜单折叠后，图标不见了

<template>
  <template v-if="haspurview(item)">
    <!-- <template v-if="!item.hidden || item.hidden !== true"> -->
    <el-menu-item
      v-if="hasChild(item) == 0"
      :index="resolvePath(item.path)"
      :key="resolvePath(item.path)"
    >
      <template #title>
        <el-icon>
          <component :is="item.meta?.icon" />
        </el-icon>
        <span>{{ item.meta?.title }}</span>
      </template>
    </el-menu-item>

    <!-- <template v-else-if="hasChild(item) == 1 && item.meta?.menuup"> -->

    <el-menu-item
      v-if="hasChild(item) == 1"
      :index="resolvePath(onlyOneChild.path)"
      :key="resolvePath(onlyOneChild.path)"
    >
      <template #title>
        <el-icon>
          <component :is="onlyOneChild.meta?.icon" />
        </el-icon>
        <span>{{ onlyOneChild.meta?.title }}</span>
      </template>
    </el-menu-item>

    <el-sub-menu
      v-if="hasChild(item) > 1"
      :index="resolvePath(item.path)"
      :key="resolvePath(item.path)"
    >
      <template #title>
        <el-icon v-if="item.meta?.icon">
          <component :is="item.meta?.icon" />
        </el-icon>
        <span>{{ item.meta?.title }}</span>
      </template>
      <MenuItem
        v-for="child in item.children"
        :key="child.path"
        :item="child"
      />
    </el-sub-menu>
  </template>
</template>

图标不见了

解决办法是
把el-icon 从#title 中提取出来
如

    <el-menu-item
      v-if="hasChild(item) == 0"
      :index="resolvePath(item.path)"
      :key="resolvePath(item.path)"
    >
      <el-icon>
        <component :is="item.meta?.icon" />
      </el-icon>
      <template #title>
        <span>{{ item.meta?.title }}</span>
      </template>
    </el-menu-item>

运行结果

el-icon 还是要放于#title里，否则显示不正常

<el-sub-menu
      v-if="hasChild(item) > 1"
      :index="resolvePath(item.path)"
      :key="resolvePath(item.path)"
    >
      <template #title>
        <el-icon v-if="item.meta?.icon">
          <component :is="item.meta?.icon" />
        </el-icon>
        <span>{{ item.meta?.title }}</span>
      </template>