Merhaba, şöyle bir kodum var ;

var lastSong = null;
var selection = null;
var playlist = ["http://demo.kitapoda.com/bg.mp3", "http://upload.wikimedia.org/wikipedia/commons/a/a9/Tromboon-sample.ogg", "http://static1.grsites.com/archive/sounds/background/background007.mp3", "http://static1.grsites.com/archive/sounds/background/background006.mp3", "http://static1.grsites.com/archive/sounds/background/background005.mp3"]; // List of Songs
var player = document.getElementById("audioplayer"); // Get Audio Element
player.autoplay=true;
player.addEventListener("ended", selectRandom); // Run function when song ends

function selectRandom(){
while(selection == lastSong){ // Repeat until different song is selected
selection = Math.floor(Math.random() * playlist.length);
}
lastSong = selection; // Remember last song
player.src = playlist[selection]; // Tell HTML the location of the new Song

}

selectRandom(); // Select initial song
player.play(); // Start Song

<button class="btn btn-primary" onclick="play()"><i class="fa fa-play"></i> </button>
<button class="btn btn-primary" onclick="pause()"><i class="fa fa-pause"></i> </button>

bu butonlara basıldığında nasıl aksiyon yaptırabilirim?