监听video的播放按钮

//音乐开关
var myvideo=document.getElementById('videoBtn');
myvideo.addEventListener('play',function(){
var audio = document.getElementById('bgPlayer');
if(myvideo.paused){
audio.play();
$(".M-btn").addClass("on")
}else{
audio.pause();
$(".M-btn").removeClass("on")
}
});
myvideo.addEventListener('pause',function(){
var audio = document.getElementById('bgPlayer');
if(myvideo.paused){
audio.play();
$(".M-btn").addClass("on")
}else{
audio.pause();
$(".M-btn").removeClass("on")
}
});