Collections are configuration objects for Tribute, you can have multiple for each instance. This is useful for scenarios where you may want to match multiple trigger keys, such as @ for users and # for projects.
Collection object shown with defaults:
{
//ture:自动定位，false：手动定位，other：trigger fontSize,width at 列表宽度
positionMenu: true||false||{width: , fontSize: 12}
}