JavaScript function sound looped

I'm just new to JavaScript and I'm having trouble at the mp3 loop on function, but it doesn't loop when it's not on the function. I wanted to play the audio once while still on the function. Here is an example

var winmsc = new Audio("../audio/win.mp3");
winmsc.loop = false;
var gend = false; // (for my game to end)
var a = 1;

if (a == 1) {
gend = true;
}

if (gend == true) {
endscreen();
}

function endscreen() {
winmsc.play();
}