1         function fRandomBy(under, over){ 2         switch(arguments.length){ 3             case 1: return parseInt(Math.random()*under+1); 4             case 2: return parseInt(Math.random()*(over-under+1) + under); 5             default: return 0; 6             } 7         }  8         $(function(){ 9         setInterval(function(){10             if($(‘.curTime‘).text().replace("00:00","")==$(‘.totalTime‘).text().substr(0,$(‘.totalTime‘).text().length-1)+"0"){11                 var curSong=fRandomBy(1,$(‘.playlist-length‘).text().replace(/\D/g,‘‘));12                 console.log(curSong);13                 $(‘div[reellist-row=‘+curSong+‘]‘).dblclick()14         }15         },1000)16     })