vue element-ui prop 同时校验两个输入框都不能为空

<el-row>
            <el-col :span="24">
                <el-form-item label="故障阈值:"  class="a_row"  :prop="addForm.thresholdFaultMin.length == 0 ? 'thresholdFaultMin' : 'thresholdFaultMax'">
                    <el-input  v-model="addForm.thresholdFaultMin"  placeholder="请输入最小阈值"/>
                    <span>--</span>
                    <el-input  v-model="addForm.thresholdFaultMax"  placeholder="请输入最大阈值"/>
                </el-form-item>
            </el-col>
        </el-row>

 

　

      rules: {
        thresholdFaultMax:[
          { required: true, message: '故障阈值的最大阈值不能为空', trigger: 'blur' }
        ],
        thresholdFaultMin:[
          { required: true, message: '故障阈值的最小阈值不能为空', trigger: 'blur' }
        ]
      }