el-select结合el-tree的使用，通过封装组件来实现

最终运行的结果：

组件的封装：可以直接C V大法

<template>
  <el-select collapse-tags ref="selectTree" :value="value" v-model="valueName" :multiple="multiple" :clearable="clearable"
             @clear="clearHandle" @change="changeValue">
    <el-option :value="valueName" class="options">
      <el-tree
        id="tree-option"
        ref="selectTree"
        show-checkbox
        :accordion="accordion"
        :data="options"
        :props="props"
        node-key="id"
        :node-key="props.value"
        @check-change="handleNodeClick">
                <span slot-scope="{ data }">
                    <i :class="[data.color!=null?'ification_col':'']" :style="{'background-color':data.color}"></i>&nbsp;&nbsp;{{ data.name }}
                </span>
      </el-tree>
    </el-option>
  </el-select>
</template>
<script>
  export default {
    name: "el-tree-select",
    props: {
      // 配置项
      props: {
        type: Object,
        default: () => {
          return {
            value: 'id',
            children: 'children',
            label: 'name'
          }
        }
      },
      // 选项列表数据(树形结构的对象数组)
      options: {
        type: Array,
        default: () => {
          return []
        }
      },
      // 初始值（单选）
      value: {
        type: Object,
        default: () => {
          return {}
        }
      },
      // 初始值（多选）
      valueMultiple: {
        type: Array,
        default: () => {
          return []
        }
      },
      // 可清空选项
      clearable: {
        type: Boolean,
        default: true
      },
      // ⾃动收起
      accordion: {
        type: Boolean,
        default: true
      },
      // 是否多选
      multiple: {
        type: Boolean,
        default: false
      }
    },
    data() {
      return {
        resultValue: [], // 传给⽗组件的数组对象值
        valueName: this.multiple ? [] : '' // 输⼊框显⽰值
      }
    },
    watch: {
      value() {
        this.resultValue = this.multiple ? this.valueMultiple : this.value;   // 初始值
        this.initHandle()
      }
    },
    mounted() {
      this.resultValue = this.multiple ? this.valueMultiple : this.value;   // 初始值
      this.initHandle();
    },
    methods: {
      // 初始化显⽰
      initHandle() {
        if (this.resultValue) {
          if (this.multiple) {
            // 多选
            this.resultValue.forEach(item => this.valueName.push(item.name));
          } else {
            // 单选
            this.valueName = this.resultValue.name;
          }
        }
        this.initScroll()
      },
      // 初始化滚动条
      initScroll() {
        this.$nextTick(() => {
          let scrollWrap = document.querySelectorAll('.el-scrollbar .el-select-dropdown__wrap')[0]
          let scrollBar = document.querySelectorAll('.el-scrollbar .el-scrollbar__bar')
          scrollWrap.style.cssText = 'margin: 0px; max-height: none; overflow: hidden;'
          scrollBar.forEach(ele => ele.style.width = 0)
        })
      },
      // 切换选项
      handleNodeClick(node) {
        // 点击叶⼦节点后被选中
        if (node.children == null || node.children == undefined) {
          if (this.multiple) {
            // 多选（判重后添加）
            let num = 0;
            this.valueName.forEach(item => {
              item == node[this.props.label] ? num++ : num;
            })
            if (num == 0) {
              this.valueName.push(node[this.props.label]); // 输⼊框显⽰值
              this.resultValue.push(node);
            }
          } else {
            // 单选
            this.$refs.selectTree.blur();
            this.valueName = node[this.props.label];
            this.resultValue = node;
          }
          this.$emit('getValue', this.resultValue);
        }
      },
      // 从输⼊框中直接删除某个值时
      changeValue(val) {
        if (this.multiple) {
          // 多选（同时删掉传给⽗组件中多余的值，再传给⽗组件）
          this.resultValue.map((item, index) => {
            let i = val.indexOf(item.name)
            if (i == -1) {
              this.resultValue.splice(index, 1)
            }
          })
          this.$emit('getValue', this.resultValue);
        } else {
          // 单选
          this.$emit('getValue', val);
        }
      },
      // 清除选中
      clearHandle() {
        this.valueName = this.multiple ? [] : ''
        this.resultValue = []
        this.clearSelected()
        this.$emit('getValue', this.resultValue)
      },
    }
  }
</script>
<style scoped>
  .el-scrollbar .el-scrollbar__view .el-select-dropdown__item {
    height: auto;
    max-height: 300px;
    padding: 0;
    overflow: hidden;
    overflow-y: auto;
  }

  .el-select-dropdown__item.selected {
    font-weight: normal;
  }

  ul li >>> .el-tree .el-tree-node__content {
    height: auto;
    padding: 0 20px;
  }

  .el-tree-node__label {
    font-weight: normal;
  }

  .el-tree >>> .is-current .el-tree-node__label {
    color: #409EFF;
    font-weight: 700;
  }

  .el-tree >>> .is-current .el-tree-node__children .el-tree-node__label {
    color: #606266;
    font-weight: normal;
  }

  .el-popper {
    z-index: 9999;
  }

  .ification_col {
    width: 20px;
    height: 10px;
    display: inline-block;
  }
</style>

页面引入：

template标签页：

<!-- 单选 + 默认值 -->
<el-select-tree :options="options" :value="value" @getValue="getSelectedValue"></el-select-tree>

<!-- 多选 + 默认值 -->
<el-select-tree :options="options" :multiple="multiple" @getValue="getSelectedValue"></el-select-tree>


script标签:
<script>
  import elSelectTree from '../../../views/runReport/wiring/Index'   //对封装的组件进行引入
  export default {
    components:{
      elSelectTree
    },
    data() {
      return {
      multiple: true,
        options: [
          {
            id: 1,
            name: '张⼀',
            children: [{
              id: 2,
              name: '张⼆',
              children: [{
                id: 3,
                name: '张三'
              }, {
                id: 4,
                name: '张四'
              }]
            }]
          },
          {
            id: 5,
            name: '王⼀',
            children: [{
              id: 6,
              name: '王⼆'
            }, {
              id: 7,
              name: '王三'
            }]
          },
          {
            id: 8,
            name: '李⼀',
            children: [{
              id: 9,
              name: '李⼆'
            }, {
              id: 10,
              name: '李三'
            }]
          }
        ]
      }
    },
    methods: {
        // 组件传出来的选中结果
        getSelectedValue(value) {
            //直接打印value我是获取了object对象数组，打印内容：[object,object]需要对其转换一下
            console.log('选中的结果值',JSON.stringify(value))
        }
    }
  }
</script>