macOS Sierra为python2.7安装PyQt5(macOS Sierra install PyQt5 for python2.7)

 首先，在您的代码中，您不应该将queryInterface方法分配给变量，而是return它： 
 
...
return queryInterface.createTable('users', {
...
 
 down功能相同： 
 
return queryInterface.dropTable('users');
 
 更重要的是，为了反映数据库中的这些变化，你应该使用sequelize-cli 。 您可以通过sequelize db:migrate运行sequelize db:migrate 。 您还可以使用sequelize help获取有关CLI命令和选项的更多信息。 

First of all, in your code you should not assign the queryInterface method to variable, instead return it:
 
...
return queryInterface.createTable('users', {
...
 
The same in the down function:
 
return queryInterface.dropTable('users');
 
What is more, in order to reflect those changes in the database, you should use the sequelize-cli. You can run migrations via sequelize db:migrate. You can also use sequelize help in order to get more information concerning commands and options of the CLI.