设计一个vue3的el-form-item两列四行的布局

可以使用`ElRow`和`ElCol`组件来实现两列四行的布局，每行包含两个`ElFormItem`组件。

示例代码如下：

<template>
  <el-form>
    <el-row>
      <el-col :span="12">
        <el-form-item label="姓名" prop="name">
          <el-input v-model="form.name"></el-input>
        </el-form-item>
      </el-col>
      <el-col :span="12">
        <el-form-item label="年龄" prop="age">
          <el-input v-model="form.age"></el-input>
        </el-form-item>
      </el-col>
    </el-row>
    <el-row>
      <el-col :span="12">
        <el-form-item label="性别" prop="gender">
          <el-radio-group v-model="form.gender">
            <el-radio label="male">男</el-radio>
            <el-radio label="female">女</el-radio>
          </el-radio-group>
        </el-form-item>
      </el-col>
      <el-col :span="12">
        <el-form-item label="职业" prop="job">
          <el-select v-model="form.job" placeholder="请选择">
            <el-option label="工程师" value="engineer"></el-option>
            <el-option label="教师" value="teacher"></el-option>
            <el-option label="医生" value="doctor"></el-option>
          </el-select>
        </el-form-item>
      </el-col>
    </el-row>
    <el-row>
      <el-col :span="12">
        <el-form-item label="手机号码" prop="phone">
          <el-input v-model="form.phone"></el-input>
        </el-form-item>
      </el-col>
      <el-col :span="12">
        <el-form-item label="邮箱" prop="email">
          <el-input v-model="form.email"></el-input>
        </el-form-item>
      </el-col>
    </el-row>
    <el-row>
      <el-col :span="24">
        <el-form-item>
          <el-button type="primary" @click="submitForm">提交</el-button>
        </el-form-item>
      </el-col>
    </el-row>
  </el-form>
</template>

<script>
export default {
  data() {
    return {
      form: {
        name: '',
        age: '',
        gender: '',
        job: '',
        phone: '',
        email: ''
      }
    };
  },
  methods: {
    submitForm() {
      this.$refs.form.validate(valid => {
        if (valid) {
          console.log('submit form');
        } else {
          console.log('validation failed');
          return false;
        }
      });
    }
  }
};
</script>

效果如下：