el-select与el-tree的联动，切换勾选保存回显功能（全部代码）

<template>
  <div class="system-role-dialog-container">
    <el-dialog draggable :title="title" v-model="isShowDialog" width="30%">
      <el-form :model="menuRoleForm" label-width="100px">
        <el-row :gutter="35">
          <el-col :xs="24" :sm="12" :md="12" :lg="12" :xl="12" class="mb20">
            <el-form-item label="应用名称 :">
              <el-select v-model="menuRoleForm.appList">
                <el-option v-for="item in menuOptions" :key="item.label" :label="item.label" :value="item.value" />
              el-select>
            el-form-item>
          el-col>
          <el-col :xs="24" :sm="24" :md="24" :lg="24" :xl="24" class="mb20">
            <el-form-item label="菜单权限 :">
              
              <div v-for="(item, index) in treeMenu.appList" :key="index">
                <div v-if="item.appCode">
                  <el-tree :data="allTreeData[item.appCode]" ref="treeEle" :label="'title'" node-key="id"
                    :code="item.appCode" :props="treeProps" :current-node-key="currentKey"
                    :default-checked-keys="selectedNode[item.appCode]" @check="changeCheck"
                    v-show="menuRoleForm.appList === item.appCode" show-checkbox>
                  el-tree>
                div>
              div>
            el-form-item>
          el-col>
        el-row>
      el-form>
      <template #footer>
        <span class="dialog-footer">
          <el-button @click="onCancel" size="default">取 消el-button>
          <el-button type="primary" @click="onSubmit" size="default">确定el-button>
        span>
      template>
    el-dialog>
  div>
template>

 
<style scoped lang="scss">
.system-role-dialog-container {
  .menu-data-tree {
    width: 100%;
    border: 1px solid var(--el-border-color);
    border-radius: var(--el-input-border-radius, var(--el-border-radius-base));
    padding: 5px;
  }
}
style>