Vue下拉框双向联动效果的示例代码

    <el-col :span="12">
        <el-form-item label="选项A"  prop="A">            
          <el-select style="width: 100%;" @change="changeAList($event)"
            v-model="temp.A"
            filterable
            remote
            clearable
            placeholder="请选择"
            :remote-method="getAMethod"
            :loading="loading">
            <el-option
              v-for="item in ListA"
              :key="item.value"
              :label="item.value"
              :value="item.label">
            </el-option>
          </el-select>
        </el-form-item>
      </el-col>
      <el-col :md="12" >
        <el-form-item label="选项B"  prop="B">            
          <el-select style="width: 100%;" @change="changeBList($event)"
            v-model="temp.B"
            filterable
            remote
            clearable
            placeholder="请选择"
            :remote-method="getBMethod"
            :loading="loading">
            <el-option
              v-for="item in ListB"
              :key="item.value"
              :label="item.value"
              :value="item.label">
            </el-option>
          </el-select>
        </el-form-item>
      </el-col>

data() {
    return {
              ListA: [],
              ListB: [],
        }

   getAMethod(temp) {
        XXapi.getAValue(temp)
        .then(response => {
          if(response.data && response.status == 200){
            this.ListA= []
            var result = response.data.data.XX
            let JSONObj = JSON.parse(result);
            for (let k of Object.keys(jsonObj)) {
              this.ListA.push(
                {
                  label: k,
                  value: jsonObj[k].属性A,
                }
              )
            }
          }
        })
      },
      getBMethod(temp) {
        XXAPI.getDicValue2(temp)
        .then(response => {
          if(response.data && response.status == 200){
            this.ListB = []
            var result = response.data.data.XX
            let jsonObj = JSON.parse(result);
            for (let k of Object.keys(jsonObj)) {
              this.ListB .push(
                {
                  label: k,
                  value: jsonObj[k].属性B,
                }
              )
            }
          }
        })
      },

@change="changeAList($event) 和 @change="changeBList($event)

   changeBList(e){
      this.indexSelectB(e)
    },
   changeAList(e){
      this.indexSelectA(e)
    },
 
     indexSelectB(e){
        if(this.ListA == undefined || this.ListA .length <= 0){
            this.getAMethod(this.temp);
        }
        let i = 0;
        for (i = 0;i<this.ListA .length;i++) {
          if (this.ListA [i].label == e){
            this.temp.A= this.ListA [i].value;
            break
          }
        }
      },
      indexSelectA(e){
        if(this.ListB == undefined || this.ListB.length <= 0){
            this.getBMethod(this.temp);
        }
        let i = 0;
        for (i = 0;i<this.ListB.length;i++) {
          if (this.ListB[i].label == e){
            this.temp.B= this.ListB[i].value;
            break
          }
        }
      }

created() {
    ...
    this.getAMethod(this.temp);
    this.getBMethod(this.temp);
    ...
  },