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增加参数 folding 设置默认隐藏的项
增加参数 collapse-node 设置收缩按钮，点击按钮后自动切换显示/隐藏的项

<vxe-form :data="formData4" title-align="right" title-width="100" @submit="searchEvent" @reset="resetEvent">
  <vxe-form-item title="名称" field="name" span="8">
     <template #default>
       <vxe-input v-model="formData4.name" placeholder="请输入名称"></vxe-input>
	 </template>
   </vxe-form-item>
   <vxe-form-item title="昵称" field="nickname" span="8" :title-prefix="{ message: '请输入汉字！', icon: 'fa fa-exclamation-circle' }">
     <template #default>
       <vxe-input v-model="formData4.nickname" placeholder="请输入昵称"></vxe-input>
     </template>
   </vxe-form-item>
   <vxe-form-item title="性别" field="sex" span="8">
   	  <template #default>
	     <select v-model="formData4.sex" class="vxe-select">
	       <option value="0"></option>
	       <option value="1">女</option>
	       <option value="2">男</option>
	     </select>
     </template>
   </vxe-form-item>
   <vxe-form-item title="年龄" field="age" span="8" :title-prefix="{ message: '请输入数值！', icon: 'fa fa-info-circle' }">
   	<template #default>
	     <vxe-input v-model="formData4.age" type="number" placeholder="请输入年龄"></vxe-input>
     </template>
   </vxe-form-item>
   <vxe-form-item title="区域" field="region" span="8">
	   <template #default>
	     <vxe-input v-model="formData2.region" placeholder="请输入区域"></vxe-input>
     </template>
   </vxe-form-item>
   <vxe-form-item title="状态" field="status" span="8">
	   <template #default>
	     <select v-model="formData4.status" class="vxe-select">
	       <option value=""></option>
	       <option value="0">失败</option>
	       <option value="1">成功</option>
	     </select>
     </template>
   </vxe-form-item>
   <vxe-form-item title="身高" field="height" span="8" folding>
	   <template #default>
	     <vxe-input v-model="formData4.height" placeholder="请输入身高"></vxe-input>
     </template>
   </vxe-form-item>
   <vxe-form-item title="体重" field="weight" span="8" folding>
	   <template #default>
	     <vxe-input v-model="formData4.weight" placeholder="请输入体重"></vxe-input>
     </template>
   </vxe-form-item>
   <vxe-form-item title="是否单身" field="single" span="8" folding>
	   <template #default>
	     <vxe-radio-group v-model="formData4.single">
	       <vxe-radio label="1">是</vxe-radio>
	       <vxe-radio label="0">否</vxe-radio>
	     </vxe-radio-group>
     </template>
   </vxe-form-item>
   <vxe-form-item align="center" span="24" collapse-node>
	   <template #default>
	     <vxe-button type="submit" status="primary">查询</vxe-button>
	     <vxe-button type="reset">重置</vxe-button>
     </template>
   </vxe-form-item>
</vxe-form>

export default {
  data () {
     return {
       formData4: {
         name: '',
         nickname: '',
         sex: '',
         age: 30,
         status: '1',
         region: null,
         height: '178',
         weight: null,
         single: '1'
     }
   }
}