In

In allows you to specify multiple values of same column. It is a shorthand for multiple or query.

Sql

Select * From Table_Name
Where
Column_Name In (value1, value2, ...);

JsStore

connection.select({
    from: "Table_Name",
    where: {
        Column_Name: { 
            in: [value1, value2, ...]
        }
    }
}).then(function(results) {
    //results will be array of objects.
    console.log(results);
}).catch(function(error) {
    alert(error.message);
});

Example