Audio() tag in JavaScript

My code is as follows, but not executable! And anything that clicks on the play button doesn't run

HTML:

<button id="play"><img id="playicon" src="img/Polygon 1.svg"></button>

JS:'song0' is a variable sound and sounds in 'playPauseEvent' and out of function but does not work in performance, I found this method on the following site

https://www.developphp.com/video/JavaScript/Audio-Seek-and-Volume-Range-Slider-Tutorial

var playpause, play1icon, song0;

function aslekar(){
    song0 = new Audio();
    song0 = 'audio/Meydoon.mp3';
    song0.loop = true;
    song0.play();

    document.getElementById("moon");
    play1icon = document.getElementById("playicon");
    playpause = document.getElementById("play");

    playpause.addEventListener("click", playPauseEvent);

    function playPauseEvent(){
        if(song0.paused){
            song0.play();

            play1icon.setAttribute("src", "img/Polygon 1.svg");
        }else{
            song0.pause();

            play1icon.setAttribute("src", "img/Group 1.svg");
        }
    }
}
window.addEventListener("load", aslekar);

I am very beginner and hope you can help with this :)