contextmenu right mouseclick

Question

hello guys,
the function fahnen(fahne) is executed more often than a right-click with the mouse and left-click then also.
what is wrong.
thank you four you answers.

document.addEventListener("contextmenu", function(ev){
$("#play_area tr td").mousedown(function(eve) {
var fahne = $(this).index('td')-100;
fahnen(fahne);
});
ev.preventDefault();
}, false);

Answer 1

Note, context menus aren't always right click (rather, it's more like "secondary click")... left-handers, gamers, etc reprogram stuff all the time.
https://developer.mozilla.org/en-US/docs/Web/Events/mousedown

Look at the 'button' property, which tells you which button was just pressed; these refer to the more common right-handed arrangement. It goes on to describe how their order could be reversed, but that's annoying... if you remember that primary starts with 0, you can avoid the left/right stuff.