jq tab图片切换

<div class="wrapper">
    <ul class="tab">
        <li class="tab-item active">国际大牌<span>◆</span></li>
        <li class="tab-item">国妆名牌<span>◆</span></li>
        <li class="tab-item">清洁用品<span>◆</span></li>
        <li class="tab-item">男士精品</li>
    </ul>
    <div class="products">
        <div class="main selected">
            <a href="###"><img src="imgs/guojidapai.jpg" alt=""/></a>
        </div>
        <div class="main">
            <a href="###"><img src="imgs/guozhuangmingpin.jpg" alt=""/></a>
        </div>
        <div class="main">
            <a href="###"><img src="imgs/qingjieyongpin.jpg" alt=""/></a>
        </div>
        <div class="main">
            <a href="###"><img src="imgs/nanshijingpin.jpg" alt=""/></a>
        </div>
    </div>
</div>
<script src="jquery-1.12.4.js"></script>
<script>
    $(function () {
       $(".tab-item").mouseenter(function () {
          $(this).addClass("active").siblings().removeClass("active");
          var idx=$(this).index();
          $(".main").eq(idx).addClass("selected").siblings().removeClass("selected");
       });
    });
</script>