关于vue.js:elformitem校验多个字段

<el-form-item label="考勤周期：" prop="cycleEnd">

<el-select @change="cycleChange" v-model="formmodel.cycle">    <el-option    v-for="item in cycleOption"    :key="item.id"    :label="item.label"    :value="item.id"    >    </el-option></el-select><el-select v-model="formmodel.cycleStart">    <el-option    v-for="item in cycleDateOption"    :key="item.id"    :label="item.label"    :value="item.id"    >    </el-option></el-select><el-select v-model="formmodel.cycleEnd">    <el-option    v-for="item in cycleDateOption"    :key="item.id"    :label="item.label"    :value="item.id"    >    </el-option></el-select>

</el-form-item>

data() {

return {  visible: false,  formmodel: {    cycle:'1'  },  formRules: {    date: [{ required: true, message: "请抉择考勤月份" }],    cycleEnd: [{ required: true, validator:(rules,value,callback)=>{      let {cycleStart} = this.formmodel      if (!value||!cycleStart) {        return callback(new Error("请抉择考勤周期"))      }      return callback()    } }],  },  formRules2: {    date: [{ required: true, message: "请抉择考勤月份" }]  }};

},