效果图(一个弹窗加下拉选择框的点击事件)，用处应该很多的。

定义一个表单或表格

<avue-form
  ref="myform"
  :option="option"
  v-model="form"
  @selection-change="handleSelectionChange"
  :upload-preview="uploadPreview"
  :upload-error="uploadError"
  :upload-before="uploadBefore"
  :upload-after="uploadAfter"
  @submit="examineManageSubmit">
  

下拉框写在option里面

{
  label: '下拉框名称',
  prop: 'Id',// 绑定字段
  type: 'tree',// 树型下拉，有一个过滤功能，也可以时select普通的下拉框
  searchLabelWidth: 100, // 可以忽略
  minWidth: 100,// 可以忽略
  labelWidth: 120,// 可以忽略
  searchSpan: 4,// 可以忽略
  dicUrl: 'url',// 需要绑定数据的地址，需要使用dicData绑定数据，可以参考一下连接
  props: {//默认不写就是label和value
    label: 'name',// url传过来的数据名称
    value: 'id',// 数据id，
  },
},

树型下拉选择框

监听下拉框数据变化的事件

data(){ 
},
watch:{
  'form.Id':{// form是表单或者表格绑定的数据集，v-model='form'
    handler(val){
      if(val!='' && val!=undefined && val!=null){
        queryIndexManage(val).then(res=>{// 可以请求后端的方法
          res.data.data
        });
      }
    },
    immediate: true
  }
},
methods: {
}

完整代码（一个弹窗功能）

<template>
  <div class="legal-main">
    <el-row class="legal-top">
      <el-button class="legal-top-add" type="primary" size="small" @click="dialogIndexManage()">测试</el-button>
    </el-row>
    <el-dialog
      title="测试"
      :visible.sync="dialogFormVisible"
      :modal-append-to-body="false"
      :append-to-body="true">
      <avue-form
        ref="myform"
        :option="option"
        v-model="form"
        @selection-change="handleSelectionChange"
        :upload-preview="uploadPreview"
        :upload-error="uploadError"
        :upload-before="uploadBefore"
        :upload-after="uploadAfter"
        @submit="examineManageSubmit"
      >
      </avue-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="dialogFormVisible=false">取 消</el-button>
      </div>
    </el-dialog>
  </div>
</template>
<script>
    import {baseUrl2} from "@/config/env";
    import {update,remove,queryIndexManage,examineManageSave,getDetail,
    } from "@/api/evaluate/check/checkmanage";

    export default {
        data() {
            return {
              selectionList: [],
              form:{queryIndexManageList : [],type: '2'},
              dialogFormVisible: false,
              option: {
                submitText: "完成",
                submitBtn: true,
                emptyBtn: true,
                printBtn: true,
                column: [
                {
                  label: 'XXXXXXXX',
                  prop: 'indexmanageId',
                  type: 'tree',
                  searchLabelWidth: 100,
                  minWidth: 100,
                  labelWidth: 120,
                  searchSpan: 4,
                  dicUrl: baseUrl2 + '/indexmanage/queryIndexManage'
                },
                {
                  prop: 'queryIndexManageList',
                  type: 'dynamic',
                  span:24,
                  children: {
                    align: 'center',
                    headerAlign: 'center',
                    addBtn: false,
                    rowDel:(row,done)=>{done();},
                    column: [
                    {
                      label: 'XXXXXXXXXXXXXXXXXXXXXXXXXXXX',
                      children: [
                        {
                          label: 'XXXXX',
                          prop:'name'
                        },
                        {
                          label: 'XXXX',
                          prop: 'content'
                        },
                        {
                          label: 'XXXXXX',
                          prop: 'spec'
                        },
                        {
                          label: 'XXXXX',
                          prop: 'score'
                        }
                      ]
                    },
                    {
                      label: 'XXXXXXXXXXXXXX',
                      prop: 'unitResponsibleForEvaluatioList',
                      type:'tree',
                      searchLabelWidth: 100,
                      minWidth: 100,
                      labelWidth: 120,
                      searchSpan: 4,
                      dicUrl: baseUrl2 + '/judicial/dept/select',
                      multiple:true
                    }]
                  }
                }
              ] 
            }
          }
        },
        watch:{
          'form.indexmanageId':{
            handler(val){
              if(val!='' && val!=undefined && val!=null){
                queryIndexManage(val).then(res=>{
                  this.form.queryIndexManageList.push(res.data.data);
                });
              }
            },
            immediate: true
          }
        },
        methods: {
          dialogIndexManage(){
           this.dialogFormVisible = true;
          },
          examineManageSubmit(row,done){
            if(row.id){// 修改
              examineManageupdate(row).then(res=>{
                this.onLoad(this.page);
                this.$message({
                  type: "success",
                  message: "操作成功!"
                });
                this.dialogFormVisible= false;
                this.$refs.myform.resetForm();
                done();
              }, error => {
                done();
                console.log(error);
              });
            }else{//添加
              examineManageSave(row).then(res=>{
                this.onLoad(this.page);
                this.$message({
                  type: "success",
                  message: "操作成功!"
                });
                this.dialogFormVisible= false;
                this.$refs.myform.resetForm();
                done();
              }, error => {
                done();
                console.log(error);
              });
            }
          },
          // 编辑回显查询
          dialogIndexManageDetail(row){
            if(!row.id){
              this.$message.error("没有找到对应编号!");
            }
            getDetail(row.id).then((res)=>{
              this.form = res.data.data;
            })
            this.dialogFormVisible = true;
          }
        }
    }

</script>

<style lang="scss">
  .basic-container .el-card {
    background: transparent;
    margin: 0 0 88px 0;
  }
  .legal-main {
    background-color: #e5f4f9;

    .legal-top {
      text-align: right;

      .el-button {
        border: none;
        min-width: 80px;
      }

      &-add {
        background: #3990d6;
      }

      &-to {
        background: #3990d6;
      }

      &-out {
        background: #f1c232;
      }

      &-del {
        background: #cc3333;
      }

      .el-divider {
        background-color: #9dcbe8
      }
    }

    .avue-crud {
      &-search {
        .el-button {
          background: #41c7db;
          border: none;
          min-width: 100px;
        }
      }

      .el-table {
        background: #f2f2f2;

        th {
          color: #868686;
          font-weight: 500;
        }
      }
    }
  }
</style>