In allows you to specify multiple values in a Where.It can be used to execute multiple or condition.

Sql (Where)

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