实现难点：

1.对于普通列数据el-table表格可做到多条件筛选，但是对于带tree树形结构类型的数据只能筛选到最上层节点，子节点不会筛选
2.考虑到缺陷，因此查看文档只能通过文档提供的filter-change事件手动筛选数据。
思路：1.通过filter-change事件使用filterObj对象保存点击的筛选状态
    2.先将当前树形数据转变成普通列数据，再进行手动过滤，过滤后以 普通列数据展示
   3.当无筛选条件时再以树形结构展示

图例：

 

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实现步骤：

1.数据初始化

data:{
    return{
         targetNode:{},//总数据，保持tree数据类型
         tableData:[],//展示在table上的数据
         filterObj:{isEnable:[],filterTypeAttr:[],filterTypeCondition:[]},//过滤条件,由于表        格组件filterchange方法只会提示当前的筛选项，
            //所以使用filterObj来保存所有筛选过的选项   
    }
}

2.表格

<el-table
 :data="tableData"
 row-key="id"
 border
 default-expand-all
 v-loading="loading"
 @filter-change="filterChange"
 ref="filterTable"
 :tree-props="{children: 'children', hasChildren: 'hasChildren'}">
 <el-table-column prop="index"  label="顺序"  width="180">
    <template slot-scope="scope">{{(scope.$index + 1)}}</template>
 </el-table-column>
 <el-table-column prop="filterName" label="筛选项" width="180">
    <template slot-scope="scope"><span :class="        
      [scope.row.filterTypeCondition==1?'filter-name':'']">{{ scope.row.filterName }} 
     </span><i v-if="scope.row.filterTypeAttr!==2" class="el-icon-plus" style="color: 
     #03a9f4;font-size: 12px;margin-left: 10px;cursor: pointer;" 
     @click="addCondition(scope.row)"></i>
   </template>
</el-table-column>
<el-table-column
  prop="filterTypeAttr" 
  column-key="filterTypeAttr"
  :filters="[{ text: '自定义', value: '1' }, { text: '机构名称', value: '2'},{ text: '无', 
  value: ''}]"
  label="筛选类型属性">
    <template slot-scope="scope">{{ scope.row.filterTypeAttr==1?'自定义':      
      scope.row.filterTypeAttr==2?'机构名称':''}}</template>
    <template slot="header" slot-scope="scope">
       <!-- {{filterObj.filterTypeAttr.length==0?'筛选类型属 
    性':filterObj.filterTypeCondition.length==1 && 
     filterObj.filterTypeCondition[0]==1?'1-筛选类型'
                        :filterObj.filterTypeCondition.length==1 && 
       filterObj.filterTypeCondition[0]==2?'2-筛选条件':'筛选类型属性-全部'}} -->
                        {{filterObj.filterTypeAttr.length==3?'筛选类型属性-全部':'筛选类型 
      属性'+(filterObj.filterTypeAttr.includes(1)?'-自定义':'')+ 
      (filterObj.filterTypeAttr.includes(2)?'-机构名称':'')+ 
       (filterObj.filterTypeAttr.includes(0)?'-无':'')}}
     </template>
</el-table-column>
<el-table-column 
    prop="filterTypeCondition"
    column-key="filterTypeCondition"
    :filters="[{ text: '1-筛选类型', value: '1' }, { text: '2-筛选条件', value: '2'}]"
    label="标识">
    <template slot-scope="scope">{{ scope.row.filterTypeCondition==1?'1-筛选类型':'2-筛选条件'}}</template>
     <template slot="header" slot-scope="scope">
       {{filterObj.filterTypeCondition.length==0?'标识':filterObj.filterTypeCondition.length==1 && filterObj.filterTypeCondition[0]==1?'标识-1-筛选类型':filterObj.filterTypeCondition.length==1 && filterObj.filterTypeCondition[0]==2?'标识-2-筛选条件':'标识-全部'}}
    </template>
</el-table-column>
<el-table-column prop="defaultSelected" label="是否属于默认展示项">
 <template slot-scope="scope">
   {{scope.row.defaultSelected==1?'是':scope.row.defaultSelected==0?'否':''}}
 </template>
</el-table-column>
<el-table-column prop="action" label="操作" width="250">
  <template slot-scope="scope">
    <span v-if="scope.row.filterTypeCondition==2" class="scope-span" :class=" 
   [scope.row.rule && scope.row.rule!=''?'filter-span':'']" 
    @click="showRegular(scope.row)">规则式</span>
    <span class="scope-span" @click="updateFilter(scope.row)">编辑</span>
        <el-popconfirm
           title="是否确定删除？"
           @confirm="delFilter(scope.row)"
          >
             <span class="scope-span" slot="reference" >删除</span>
       </el-popconfirm>
   </template>
</el-table-column>
<el-table-column 
    prop="isEnable"
    label="状态" 
    column-key="isEnable"
    :filters="[{ text: '启用', value: '1' }, { text: '禁用', value: '0' }]"
                    >
   <template slot-scope="scope">{{ scope.row.isEnable==1?'启用':'禁用'}}</template>
   <template slot="header" slot-scope="scope">
       {{filterObj.isEnable.length==0?'状态'
        :filterObj.isEnable.length==1 && filterObj.isEnable[0]==1?'状态-启用'
        :filterObj.isEnable.length==1 && filterObj.isEnable[0]==0?'状态-禁用':'状态-全部'}}
   </template>
</el-table-column>
</el-table>

要点：

1. default-expand-all:默认展开全部子节点

2. filterChange：获取点击的筛选条件状态，对应列表头上设置:filters属性的列

3. <template slot="header" slot-scope="scope">设置筛选后用来替换表头的label内容

 3.filterChange函数

filterChange(filters){//触发过滤事件时过滤数据
        console.log('filters',filters);
        if(filters['isEnable']){
            this.filterObj['isEnable'] = filters['isEnable'].map(Number);
        }
        if(filters['filterTypeAttr']){
            this.filterObj['filterTypeAttr'] = filters['filterTypeAttr'].map(Number);
        }
        if(filters['filterTypeCondition']){
            this.filterObj['filterTypeCondition'] = filters['filterTypeCondition'].map(Number);
        }

        if(this.filterObj['isEnable'].length==0 && this.filterObj['filterTypeAttr'].length==0 && this.filterObj['filterTypeCondition'].length==0){
            this.tableData = this.targetNode.filterList;
        }else{
            let dataList = [];
            this.targetNode.filterList.forEach(item=>{//层级数据转变成普通列数据
                let obj = {
                    filterName:item.filterName,
                    filterTypeAttr:item.filterTypeAttr,
                    sort:item.sort,
                    isEnable:item.isEnable,
                    columnId:item.columnId,
                    id:item.id,
                    filterTypeCondition:1,
                    index:item.index
                }
                dataList.push(obj);
                if(item.children){
                    dataList = dataList.concat(this.getLineData(item.children))
                }
               
            }) 
            console.log('线性数据',dataList);
            if(this.filterObj['isEnable'].length>0){//状态
                dataList = dataList.filter(item=>{
                    return this.filterObj['isEnable'].includes(item.isEnable)
                }) 
            }
            if(this.filterObj['filterTypeCondition'].length>0){//标识
                dataList = dataList.filter(item=>{
                    return this.filterObj['filterTypeCondition'].includes(item.filterTypeCondition)
                }) 
            }
            if(this.filterObj['filterTypeAttr'].length>0){//属性
                console.log('11',this.filterObj['filterTypeAttr']);
                dataList = dataList.filter(item=>{
                    return this.filterObj['filterTypeAttr'].includes(item.filterTypeAttr?item.filterTypeAttr:0)
                }) 
            }
           
            console.log('过滤数据',dataList);
            this.tableData = dataList;
        }
        
      },
      getLineData(data){//层级数据变成行数据
        let list = [];
        data.forEach(item=>{
            let obj = {};
            if(item.filterTypeCondition==1){//筛选类型
                obj = {
                    filterName:item.filterName,
                    filterTypeAttr:item.filterTypeAttr,
                    sort:item.sort,
                    isEnable:item.isEnable,
                    parentId:item.parentId,
                    id:item.id,
                    filterTypeCondition:1,
                    index:item.index
                }
            }else{
                obj = {
                    filterName:item.filterName,
                    sort:item.sort,
                    isEnable:item.isEnable,
                    parentId:item.parentId,
                    id:item.id,
                    defaultSelected:item.defaultSelected,
                    filterTypeCondition:2,
                    index:item.index
                }
            }
            list.push(obj);
            if(item.children){
                list = list.concat(this.getLineData(item.children))
            }
        })
        return list;
      },

 步骤：

        1.fiters参数为当前点击的筛选项，数据结构如下：

        

         2.使用filterObj保存当前筛选状态，筛选重置时为[]空数组

         3.保存后判断filterObj各项是否都是空数组，是则直接赋值

        4.否则将树形结构转换成普通列数据，注意考虑浅克隆的问题，getLineData函数作用是将子节点children也插入到普通列中

        5.数据转换成普通列数据后进行过滤

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实现效果：

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