我的函数设置为查找来自/LOGIN POST方法的电子邮件，但我未能正确声明变量，要插入到app.get(‘/data’)上的findOne表单中的变量是什么？
我有：

app.post('/login', function (req, res) {
    //console.log(req.body);
    const uri = "mongodb+srv://<PRIVATE INFO>.eapnyil.mongodb.net/?retryWrites=true&w=majority";
    const client = new MongoClient(uri, { useNewUrlParser: true, useUnifiedTopology: true, serverApi: ServerApiVersion.v1 });
    const users = client.db("data").collection("users");
    users.findOne({email:req.body.email},function(err,data){
        if(data){

            if(data.password==req.body.password){
                //console.log("Logged In.");
                console.log('Email in DB is: ' + data.email);
                console.log('Email in form is: ' + req.body.email);
                //res.send({"Success":"Success!"});
                res.redirect('/data');
            }else{
                res.send({"Failed with":"Wrong password!"});
            }
        }else{
            res.send({"Try again":"Email not registered!"});
        }
    });
});

app.get('/data', (req, res) => {

    const users = client.db("data").collection("users");
    users.findOne({unique_id:req.session.id})((err, result) => {
    if (err) return console.log(err)
    // renders index.ejs

    res.render('pages/data.ejs', {users: result})
  })
});

并在login.ejs文件中显示以下内容：

<p>Login</p>
</div>
<div class="form-group">
    <form id="form" method="POST" action="/login">
        <input type="text" name="email" placeholder="E-mail" required="" class="form-control"><br/>
        <input type="password" name="password" placeholder="Password" required="" class="form-control"><br/>
        <input type="submit" value="Login" class="btn btn-success">
    </form>
</div>