前端学习（1342）:验证规则出现错误

 const mongoose = require('mongoose');

    
 mongoose.connect('mongodb://localhost/playground', { useUnifiedTopology: true })
    
     .then(() => console.log('数据库连接成功'))
    
     .catch(err => console.log(err, '数据库连接失败'))
    
     //创建集合规则
    
 const postSchema = new mongoose.Schema({
    
     title: {
    
     type: String,
    
     require: [true, '请传入文章标题'],
    
     minlength: [2, '输入长度不能小于2'],
    
     maxlength: [5, '输入长度不能大于5'],const mongoose = require('mongoose');
    
 mongo