今天遇到一个变态的问题，因页面比较复杂，出现几组条件判断，每个template内部又包含很多表单！！

<template v-if="transformTypeValue == 1"></template><template v-else-if="transformTypeValue == 2"></template><template v-else-if="transformTypeValue == 3"></template><template v-else-if="transformTypeValue == 4"></template>

竟然发现表单的验证规则只有某一个无效了！！！其他一切正常！！太变态了！！

先分析以下代码：

<!-- 许可使用权 -->
<template v-if="transformTypeValue == 4"><el-row><el-col :span="10"><el-form-item label="入门费(元)" class="is-required" prop="enterFee"><el-input style="width:100%" v-model="forms.enterFee" placeholder="请输入入门费"></el-input></el-form-item></el-col><el-col :span="10"><el-form-item label="提成方式"><el-select style="width:100%" v-model="forms.commissionType" placeholder="提成方式"><el-option v-for="a in dict.type.commission_options" :key="a.value" :label="a.label":value="a.value"></el-option></el-select></el-form-item></el-col></el-row><el-row><el-col :span="10"><el-form-item label="时间段" class="is-required" prop="licenseDate"><el-date-picker style="width:100%" v-model="forms.licenseDate" type="daterange" format="yyyy-MM-dd"start-placeholder="开始日期" range-separator="-" end-placeholder="结束日期"placeholder="时间段"></el-date-picker></el-form-item></el-col><el-col :span="10"><el-form-item label="收取比例(%)" class="is-required" prop="colloctionRatio"><el-input style="width:100%" v-model="forms.colloctionRatio" placeholder="请输入收取比例"></el-input></el-form-item></el-col></el-row><el-row><el-col :span="10"><el-form-item label="受让单位" prop="transform2Units" class="is-required"><el-input style="width:100%" v-model="forms.transform2Units" placeholder="请输入受让单位"></el-input></el-form-item></el-col><el-col :span="10"><el-form-item label="通讯地址" prop="contactAddress" class="is-required"><el-input style="width:100%" v-model="forms.contactAddress" placeholder="请输入通讯地址"></el-input></el-form-item></el-col></el-row><el-row><el-col :span="10"><el-form-item label="联系人" prop="contactUser" class="is-required"><el-input style="width:100%" v-model="forms.contactUser" placeholder="请输入联系人"></el-input></el-form-item></el-col><el-col :span="10"><el-form-item label="联系人联系方式" prop="contactUserPhone" class="is-required"><el-input style="width:100%" v-model="forms.contactUserPhone" placeholder="请输入联系人联系方式"></el-input></el-form-item></el-col></el-row><el-row><el-col :span="10"><el-form-item label="合同生效日期" prop="bargainDate" class="is-required"><el-date-picker style="width:100%" v-model="forms.bargainDate" placeholder="请选择合同生效日期" format="yyyy-MM-dd"type="daterange" range-separator="至" start-placeholder="开始日期"end-placeholder="结束日期"></el-date-picker></el-form-item></el-col></el-row>
</template>

最外层使用<template></template>el-form，第二层使用el-form-item，第三层使用el-input

el-form绑定的数据对象为forms，表单的验证规则定义在formRules。整体代码如下：

data() {return {forms: {outcomesName: null,outcomesType: null,transformExpenditure: null,outcomesTransformTime: null,achievementUnit: null,achievementDeptId: null,isFundUpport: '1',transformExpenditure: null,transformPathway: null,transformType: null,attachment: [],totalInvestment: null,projInformation: null,transformMoney: null,transform2Units: null,contactAddress: null,contactUser: null,contactUserPhone: null,bargainDate: null,enterFee: null,commissionType: null,licenseDate: null,colloctionRatio: null,stockPropotion:null,cooperationUnit:null,},formRules: {outcomesName: [{ required: true, message: "成果名称不能为空", trigger: ["blur", "change"] }],outcomesType: [{ required: true, message: "成果类型不能为空", trigger: ["blur", "change"] }],transformExpenditure: [{ required: true, message: "转化经费不能为空", trigger: ["blur", "change"] }],outcomesTransformTime: [{ required: true, message: "成果转化时间不能为空", trigger: ["blur", "change"] }],achievementUnit: [{ required: true, message: "成果所属单位不能为空", trigger: ["blur", "change"] }],achievementDeptId: [{ required: true, message: "成果归属部门不能为空", trigger: ["blur", "change"] }],transformPathway: [{ required: true, message: "转化途径不能为空", trigger: ["blur", "change"] }],totalInvestment: [{ required: true, message: "总投资金额不能为空", trigger: ["blur", "change"] }],transformMoney: [{ required: true, message: "转让金额不能为空", trigger: ["blur", "change"] }],transform2Units: [{ required: true, message: "受让单位不能为空", trigger: ["blur", "change"] }],contactAddress: [{ required: true, message: "通讯地址不能为空", trigger: ["blur", "change"] }],contactUser: [{ required: true, message: "联系人不能为空", trigger: ["blur", "change"] }],contactUserPhone: [{ required: true, message: "联系人联系方式不能为空", trigger: ["blur", "change"] }],bargainDate: [{ required: true, message: "合同生效日期不能为空", trigger: ["blur", "change"] }],enterFee: [{ required: true, message: "入门费不能为空", trigger: ["blur", "change"] }],commissionType: [{ required: true, message: "提成方式不能为空", trigger: ["blur", "change"] }],licenseDate: [{ required: true, message: "时间段不能为空", trigger: ["blur", "change"] }],colloctionRatio: [{ required: true, message: "收取比例不能为空", trigger: ["blur", "change"] }],stockPropotion: [{ required: true, message: "占股比例不能为空", trigger: ["blur", "change"] }],cooperationUnit: [{ required: true, message: "合作单位不能为空", trigger: ["blur", "change"] }],},};
},

 再来看看触发验证时，通讯地址一栏无论如何也无法触发验证！！！如下动画！！

 通讯地址的验证表单prop='contactAddress'，表单内的input也是forms.contactAddress，验证规则写的也是contactAddress，这完全没有问题呀，可是为啥呢？为啥呢？为啥呢？为啥呢？为啥呢？为啥呢？

一万个艹泥马飞奔而过。。。你猜怎么着，我无论将哪个表单移动到通讯地址这块儿位置它就无法验证了。。。把通讯地址移动到别的位置就正常了！！

这特么是什么鬼。。。。无奈我就想着是不是<template></template>的问题，

我就将<template></template>改为<div></div>，一切就好了。。。无奈极了。

其他表单验证无效总结：

1、prop中使用的变量与表单v-model绑定的变量名不一样导致无法触发。

prop="enterFee",v-model="forms.enterMoney"，无法触发验证规则。

 <el-form-item label="入门费(元)" class="is-required" prop="enterFee"><el-input style="width:100%" v-model="forms.enterMoney" placeholder="请输入入门费"></el-input></el-form-item>

2、rules规则中未定义enterFee相关的验证方法导致无法触发验证规则。

3、el-from-item没有加prop导致无法触发验证规则。

4、from绑定的表单变量没有在data中定义导致无法触发验证规则。