index.js里面的代码如图 router.route(’/login’) .get(function (req,res) { res.render(‘login’, { title: ‘Express’ }); }) .post(function (req,res) { //var name=req.body.name; //var psw=req.body.psw; var newUser = new User({ name: req.body.name, psw: req.body.psw //email: req.body.email });

    console.log(req.body.name);
    User.get(newUser.name,function (err, user) {
        console.log('123');
        if(!user){
            req.flash('error','用户不存在!');
            return res.redirect('/bad-request');
        }
        if(req.body.psw!=user.psw){
            req.flash('error','用户密码不正确!');
            return res.redirect('/bad-request');
        }

        req.session.user=user;
        req.flash('success','用户登陆成功');
        res.redirect('/success');

    })
});

封装的数据库utils如下：
User.get=function(name,callback) {
mongodb.open(function(err,db) {
    if(err){
        return callback(err);
    }
    //获取user集合
    db.collection('user',function(err,collection) {
        if(err){
            mongodb.close();
            return callback(err);
        }
        //查找用户名name值为name文档
        collection.findOne({
            name:name
        },function(err,doc) {
            mongodb.close();
            if(doc){
                var user=new User();
                callback(err,user);//成功！返回查询的用户信息
            }else{
                callback(err,null);//失败！返回null
            }
        });
    });
});

};

报错如下： /Users/yanrui/project/rayblog/node_modules/mongodb/lib/utils.js:98 process.nextTick(function() { throw err; }); ^

TypeError: Cannot read property ‘name’ of undefined at new User (/Users/yanrui/project/rayblog/models/user.js:4:19) at /Users/yanrui/project/rayblog/models/user.js:53:30 at handleCallback (/Users/yanrui/project/rayblog/node_modules/mongodb/lib/utils.js:96:12) at /Users/yanrui/project/rayblog/node_modules/mongodb/lib/collection.js:1357:5 at handleCallback (/Users/yanrui/project/rayblog/node_modules/mongodb/lib/utils.js:96:12) at /Users/yanrui/project/rayblog/node_modules/mongodb/lib/cursor.js:661:5 at handleCallback (/Users/yanrui/project/rayblog/node_modules/mongodb-core/lib/cursor.js:159:5) at nextFunction (/Users/yanrui/project/rayblog/node_modules/mongodb-core/lib/cursor.js:683:5) at /Users/yanrui/project/rayblog/node_modules/mongodb-core/lib/cursor.js:585:7 at queryCallback (/Users/yanrui/project/rayblog/node_modules/mongodb-core/lib/cursor.js:220:18) at Callbacks.emit (/Users/yanrui/project/rayblog/node_modules/mongodb-core/lib/topologies/server.js:119:3) at .messageHandler (/Users/yanrui/project/rayblog/node_modules/mongodb-core/lib/topologies/server.js:358:23) at Socket.<anonymous> (/Users/yanrui/project/rayblog/node_modules/mongodb-core/lib/connection/connection.js:292:22) at emitOne (events.js:96:13) at Socket.emit (events.js:188:7) at readableAddChunk (_stream_readable.js:172:18)

新手。。求教