这是我的结构，我想补充一点奇怪甚至级在每一个两div所以我怎么可以实现这一结构使用JavaScript循环，我尝试了一切但我没有什么我学习JavaScript循环，使任何人请帮助我这个
var i = 0;
$('.CollectionInner__Products .Grid__Cell .ProductItem').each(function(i) {
var index = 0;
if (index % 3 == 0) {
$(this).addClass("odd");
}
});<div class="custompsps">
<div class="ProductItem">
</div>
<div class="ProductItem">
</div>
<div class="ProductItem">
</div>
<div class="ProductItem">
</div>
</div>
<div class="custompsps">
<div class="ProductItem">
</div>
<div class="ProductItem">
</div>
<div class="ProductItem">
</div>
<div class="ProductItem">
</div>
</div>我想这个结构：
i want this stucture
<div class="custompsps">
<div class="ProductItem even">
</div>
<div class="ProductItem even">
</div>
<div class="ProductItem odd">
</div>
<div class="ProductItem odd">
</div>
</div>
<div class="custompsps">
<div class="ProductItem even">
</div>
<div class="ProductItem even">
</div>
<div class="ProductItem odd">
</div>
<div class="ProductItem odd">
</div>
</div>