Sequelize. JS and hasmany - belongsto vs hasmany in serialize js

problem ：

What's the difference between B.belongsTo(A) and A.hasMany(B)B.belongsTo(A) and A.hasMany(B) What's the difference

Artist = sequelize.define('Artist', {});Album = sequelize.define('Albums', {});Album.belongsTo(Artist, foreignKey: 'album_belongsl_artist');Artist.hasMany(Album, foreignKey: 'artist_hasmany_albums');

if it in both cases creates the depended tables in Album ? If it is in both cases Album Created dependency table ？

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Solution ：

Reference resources ： https://stackoom.com/en/question/1N8ZD