Sequelize.js保存()结果

Question

代码如下：

(function () {
    var tag = models.Tag.build({ create_time: new Date(), is_hot: '0', is_lock: '0', name: 'Nodejs' });
    tag.save();
    console.log(tag.dataValues);
    tag.name = "npm";
    tag.save();
    console.log(tag.dataValues);
    tag = models.Tag.build({ create_time: new Date(), is_hot: '0', is_lock: '0', name: 'webpack' });
    tag.save();
    console.log(tag.dataValues);
})();

结果是：the result

在我的第一眼里，结果可能是：

Executing (default): INSERT INTO `t_tag` (`id`,`name`,`create_time`,`is_hot`,`is_lock`,`is_delete`) VALUES (NULL,'Nodejs','2016-12-23 03:09:23','0','0','0');
Executing (default): INSERT INTO `t_tag` (`id`,`name`,`create_time`,`is_hot`,`is_lock`,`is_delete`) VALUES (NULL,'npm','2016-12-23 03:09:23','0','0','0');
Executing (default): INSERT INTO `t_tag` (`id`,`name`,`create_time`,`is_hot`,`is_lock`,`is_delete`) VALUES (NULL,'webpack','2016-12-23 03:09:26','0','0','0');

这是什么原因造成的？为什么"npm“记录插入两次？