QPlayer左下角悬浮多功能mp3音乐播放器插件

部分js代码
<script type="text/javascript" src="js/player.js"></script>
<script>
function bgChange(){
var lis= $('.lib');
for(var i=0; i<lis.length; i+=2)
lis[i].style.background = 'rgba(246, 246, 246, 0.5)';
}
window.onload = bgChange;
</script>