play a sound wiith js

1var audio = new Audio('audio.mp3');
2  audio.play();

1
2var bMusic = new Audio('welcome1.mp3')
3	bMusic.play()

1//play audio with from html audio element: 
2document.getElementById('myAudioTagID').play();
3
4//play audio with out html audio tag
5var myAudio = new Audio('my_great_song.mp3');
6myAudio.play();