读取数据

ECMA6：

User.findOne({
    name: 'stack'
}, (err, user) => {
    if (err) throw err;

    if (!user) {
        console.log('No user was found');
    } else {
        console.log('User was found');
    }
});

ECMA5.1：

User.findOne({
    name: 'stack'
}, function (err, user) {
    if (err) throw err;

    if (!user) {
        console.log('No user was found');
    } else {
        console.log('User was found');
    }
});