vue 中 表单数据为数组，vfor 循环表单数据

 element-ui 中，表单数据一般为对象，但是也有是数组的情况，比如上面图示：账号和密码可以是多个，点击添加会增加一条，点击删除会删除一条

表单数据为

form：{
  accounts：[
    {
       account: '',
       password: ''
    }  
  ]
}

表单中代码

<el-form ref="form" :model="form" label-width="100px" label-suffix="：">
    <el-row v-for="(item, index) in form.accounts" :key="index">
       <el-col :span="11">
          <el-form-item
             label="系统账号"
             :prop="`accounts.${index}.account`"
             :rules="[
               {required: true, message: '请输入系统账号', trigger: 'blur'},
               {validator: checkAccount, trigger: 'blur'},
               {min: 1, max: 16, message: '系统账号至多只能包含16个字符', trigger: 'blur'}
             ]"
           >
             <el-input
               v-model="item.account"
               placeholder="请输入系统账号"
               clearable
               autocomplete="off"
              />
          </el-form-item>
       </el-col>
       <el-col :span="11">
           <el-form-item
              label="账号密码"
              :prop="`accounts.${index}.password`"
              :rules="[
                 {required: true, message: '请输入账号密码', trigger: 'blur'},
                 {min: 1, max: 16, message: '账号密码至多只能包含16个字符', trigger: 'blur'}
              ]"
           >
             <el-input
               v-model="item.password"
               type="password"
               placeholder="请输入账号密码"
               clearable
               autocomplete="new-password"
             />
          </el-form-item>

       </el-col>
       <el-col v-if="form.accounts.length >= 2" :span="2">
           <div class="form-control-delete">
             <el-button icon="el-icon-delete" circle class="btn-editDel" @click="deleteAccount(index)" />
           </div>
       </el-col>
   </el-row>
   <div class="form-control-add">
     <el-button icon="el-icon-plus" class="btn-add" @click="addAccount">添加账号</el-button>
   </div>

</el-form>

验证两个账号是否重复

data() {
  const checkAccount = (rule, value, callback) => {
      if (value === '') {
        callback(new Error('请输入系统账号'))
      } else {
        const len = this.form.accounts.length
        if (len <= 1) {
          callback()
        } else {
          const allAccount = this.form.accounts.map(v => v.account)
          const len = allAccount.length
          const filterAccount = allAccount.filter(v => v !== value)
          if (len - 1 === filterAccount.length) {
            callback()
          } else {
            callback(new Error('创建的系统账号不能重复！'))
          }
        }
      }
    }

    return {
     checkAccount: checkAccount, 
   }
}