v-if 导致 elementui 表单校验失效问题解决方案

<el-form ref="form" :model="form">
  <el-form-item 
    :key="0" 
    v-if="hasItem" 
    label="名称" 
    prop="type">
    <el-input v-model="form.name"></el-input>
  </el-form-item>
  <el-form-item 
    :key="1" 
    v-if="hasItem" 
    label="类型" 
    prop="type">
    <el-input v-model="form.type"></el-input>
  </el-form-item>
</el-form>

<el-form ref="form" :model="form">
  <el-form-item 
    :rules="{required: true, message:'请输入名称', trigger: 'change'}"
    v-if="hasItem" 
    label="名称" 
    prop="name">
    <el-input v-model="form.name"></el-input>
  </el-form-item>
  <el-form-item 
    :rules="{required: true, message:'请输入类型', trigger: 'change'}"
    v-if="hasItem" 
    label="类型" 
    prop="type">
    <el-input v-model="form.type"></el-input>
  </el-form-item>
</el-form>

<el-form ref="form" :model="form">
  <el-form-item 
    v-show="hasItem" 
    label="名称" 
    prop="name">
    <el-input v-model="form.name"></el-input>
  </el-form-item>
  <el-form-item 
    v-show="hasItem" 
    label="类型" 
    prop="type">
    <el-input v-model="form.type"></el-input>
  </el-form-item>
</el-form>

<el-form ref="form" :model="form">
  <el-form-item 
    :key="0" 
    v-if="hasItem" 
    label="名称" 
    prop="name">
    <el-input v-model="form.name"></el-input>
  </el-form-item>
  <el-form-item 
    :key="1" 
    v-if="hasItem" 
    label="类型" 
    prop="type">
    <el-input v-model="form.type"></el-input>
  </el-form-item>
</el-form>

const checkName = (rule, value, callback) => {
	if (!value) {
       return callback(new Error('名称不能为空'));
   }
}
data(){
	return{
		rules: {
   			name: [
            	{ validator: checkName , trigger: 'change' }
          	],
        }
	}
}