<el-form-item label="权益类型:" prop="legalRuleType" >
              <el-select v-model="dataForm.legalRuleType" @change="selectModel($event)" style="width:200px" placeholder="请选择" :size="size" :disabled="disabled">
                <el-option
                  v-for="item in ruleTypeList"
                  :key="item.id"
                  :label="item.ruleName"
                  :value="item.id"
                ></el-option>
              </el-select>
          </el-form-item>
selectModel(id){
        let obj = {};
        let selectModel = {};
        obj = this.ruleTypeList.find((item)=>{//model就是上面的数据源
          if(item.id === id){
            this.selectModel.legalRuleType = id;
            this.selectModel.ruleName = item.ruleName;
            this.rulePowerForm.legalRuleType  = id;
          }
        });
    },

selectModel(id){
        let obj = {};
        let selectModel = {};
        obj = this.ruleTypeList.find((item)=>{//model就是上面的数据源
          if(item.id === id){
            this.selectModel.legalRuleType = id;
            this.selectModel.ruleName = item.ruleName;
            this.rulePowerForm.legalRuleType  = id;
          }
        });
    },

方法二：

                <el-select v-model="ruleForm.AJXL"
                           placeholder="请选择"
                           @change="selectXL($event)">
                  <el-option v-for="(item,index) of XLdata"
                             :key="index"
                             :label="item.XLMC"
                             :value="{value:item.BSM,label:item.XLMC}"></el-option>
                </el-select>

        selectXL(selVal) {
            let { value, label } = selVal;
            console.log(value,label )
        },