云数据库构建条件报错？ - WXOPEN Club

db.collection('tire').where({model: _.in('F30')}).get({

success: (rs)=>{

console.log(rs)

}

})

VM2211:1 thirdScriptError

_ is not defined; [Component] Event Handler Error @ pages/tire/tire#bound submit

ReferenceError: _ is not defined

我跟着官方文档去构建的条件（https://developers.weixin.qq.com/miniprogram/dev/wxcloud/guide/database/query.html），但是报错了，这是怎么回事呢？