老师，为什么卡住之后就恢复不了了

var loadingTimer = null ;

video.on('timeupdate' , function () {

var currentTime = video[0].currentTime ;

var duration = video[0].duration;

var precent = 100 * currentTime / duration 

$('.timeBar').css('width',precent+'%') ;

$('#currentTime').html(timeFormat(currentTime));

$('.loading').fadeOut(100) ;

clearTimeout(loadingTimer) ;

loadingTimer=setTimeout( function(){

if(!video[0].paused && !video[0].ended){

$('.loading').fadeIn(100) ;

}

},500);

});