怎么判断父元素的子元素是否含有某个class

Question

判断'poi'的子元素class哪个含有'poi_on',例如下面那段代码就返回'poi2'

<div class="poi">
  <a class="poi1" href="#">&nbsp;</a>
  <a class="poi2 poi_on" href="#">&nbsp;</a>
  <a class="poi3" href="#">&nbsp;</a>
</div>

Answer 1

求人不如求己

<script>
var mypoi= $(".poi").find(".poi_on");
pnum = mypoi[0].classList;
for(i=0;i<pnum.length;i++)
{
    if(pnum[i]!="poi_on")
    {
        pclass = pnum[i];
    }
}
console.log(pclass);
</script>