How to add new field ?

[FeiCheung]

my code:
f (window.openDatabase) {
persistence.store.websql.config(persistence, 'testdb',
'My SQLite database', 5 * 1024 * 1024);
} else {
persistence.store.memory.config(persistence);
}

var User = persistence.define('User', {
name: "TEXT",
age: "INTEGER"
});
persistence.schemaSync();

my app's being in production I want to add a new field ‘sex’ to the 'user'schema.

var User = persistence.define('User', {
name: "TEXT",
age: "INTEGER",
sex:"TEXT"
});

I dont want uninstall my app , how could I add this field ?? thanks for help

[0scar14]

you can check
https://github.com/coresmart/persistencejs/blob/master/docs/migrations.md