use of auto increment in java-script

use of auto increment in java-script

How can i transform this
this.subtrigger = this.el.querySelector( '.submenu' );
this.subtrigger2 = this.el.querySelector( '.submenu2' );
this.submenu = this.el.querySelector( '.sub-menu-wrapper1' );
this.submenu2 = this.el.querySelector( '.sub-menu-wrapper2' );
Into an auto-incremented script? for example:
this.subtrigger-i = this.el.querySelector( '.submenu-i' );
this.submenu-i = this.el.querySelector( '.sub-menu-wrapper-i' );
where i is auto-incremented.
Thank you