javascript点击这个元素给这个元素变背景颜色

var vipif = document.getElementsByClassName('vip-ify')[0].getElementsByTagName('li');
for(var i = 0;i<vipif.length;i++){
vipif[i].onclick = function (){
for(var j=0;j<vipif.length;j++){
vipif[j].className='';
}
this.className = "current";
}
}

效果图