el-form动态检验无法生效问题

          <el-form-item label="状态："
                        prop="zt"
                        class="bitianxian">
            <el-select v-model="ruleForm.zt"
                       placeholder="请选择"
                       @change="emptyztXM()">
              <el-option v-for="(item,index) in ZTdata"
                         :key="index"
                         :label="item.label"
                         :value="item.value">
              </el-option>
            </el-select>
          </el-form-item>


          <el-form-item label="XXX："
                        :prop="ruleForm.zt=== 1 ? 'byclsl' : 'empty'" >
            <el-input v-model="ruleForm.byclsl"
                      v-input.float
                      @input="yanzhegn($event,'byclsl')"
                      placeholder="请输入"></el-input>
          </el-form-item>
          <el-form-item label="BBBB："
                        :prop="ruleForm.zt==1?'zgrcll':'empty'" >
            <el-input v-model.trim="ruleForm.zgrcll"
                      v-input.float
                      @input="yanzhegn($event,'zgrcll')"
                      placeholder="请输入"></el-input>
          </el-form-item>

data

            rules: {
                zt: [{ validator: reg_xiala, required: true }],
                byclsl: [{ validator: reg_kong, required: true }],
                zgrcll: [{ validator: reg_kong, required: true }],
           }

methods

        yanzhegn(event,yzname){
            if(event.length > 0){
                this.$refs.ruleForm.clearValidate(yzname);
            }else{
                this.$refs.ruleForm.validateField(yzname);
            }
        },

        emptyztXM() {
            console.log(this.ruleForm.zt != 1)
            if (this.ruleForm.zt != 1) {
                this.$refs.ruleForm.clearValidate('byclsl');
                this.$refs.ruleForm.clearValidate('zgrcll');
               
            }
        },