npm install --save linq

module:{  ......  //添加  new webpack.ProvidePlugin({   Enumerable: "linq"  })}

var selectList = [ {  name:""，//一級名稱  CName:"", //二級名稱  value:"" //值 }, {name:"",CName:"",value:""}, ......]

data (){ return{    selectModel: [],  multipleSelectOption:[], }},methods:{  //將源數據轉成element所需格式  transMultipleSelectOption(){    var level1List = Enumerable.from(this.allSelectList).distinct("o=>o.name").toArray();            var newArr = level1List.map(item=>{       let children = Enumerable.from(this.allSelectList).where((o)=>{return o.name==item.name;}).toArray();       var options = children.map(itemc=>{         return {"name": itemc.CName, "value":itemc.value};       });           return {"name": item.name, "options":options}     });     this.multipleSelectOption = newArr;  },      //重置options(select自動補全相關)  remoteMethod(queryString, lists) { //lists:原始數據     var mappedList = Enumerable.from(lists).where((o)=>{return o.CName.indexOf(queryString)!=-1        || o.name.indexOf(queryString)!=-1;}).toArray(); //找出匹配搜索關鍵字的數據集     var level1List = Enumerable.from(mappedList).distinct("o=>o.name").toArray(); //從所匹配的數據集中找出所有一級菜單集合（含去重）    //重新拼成element所需的數據格式     var newArr = level1List.map(item=>{       let children = Enumerable.from(mappedList).where((o)=>{return o.name==item.name;}).toArray();       var options = children.map(itemc=>{         return {"name": itemc.CName, "value":itemc.value};       });           return {"name": item.name, "options":options}     });     this.multipleSelectOption = newArr;  },  //點擊一級菜單全選/全不選實現  checkAll(value){ //value: 點擊的一級name     var list = Enumerable.from(this.multipleSelectOption).where((o)=>{return o.name==value;}).toArray();     var level2ValueList = Enumerable.from(list[0].options).select("o=>o.value").toArray(); //所有該一級下二級的value集合     var num=0;     level2ValueList.forEach((value)=>{       this.selectModel2.forEach((model, index)=>{        if(model==value){         this.selectModel2.splice(index, 1); //如有匹配，先刪除         num++;         return true;        }       })      })      if(num < level2ValueList.length){ //需要全選       this.selectModel2 = this.selectModel2.concat(level2ValueList); //合并數組      }     }},mounted: function(){   this.transMultipleSelectOption();},

<el-select v-model="selectModel" multiple filterable remote reserve-keyword   placeholder="請輸入關鍵詞" :remote-method="(queryString)=>{    remoteMethod(queryString, allSelectList);  }">  <el-option-group v-for="group in multipleSelectOption"   :key="group.name"   :label="group.name"    @click.native="checkAll(group.name)">   <el-option v-for="item in group.options"     :key="item.value"     :label="item.name"     :value="item.value">   </el-option>  </el-option-group></el-select>