第八课学习做的一个小案例，用来去除底部导航最后一个|

<style>
    .foot{ width: 100%;margin:0 auto; height: 80px; background: #5283ff;}
    #footnav{ list-style: none;display: flex;justify-content: center;}
    #footnav li{ font-size: 18px; padding-top:25px;}
    #footnav li a{ color: #fff6f2; text-decoration: none}
</style>
<div class="foot">
    <ul id="footnav">
        <li><a href="">首页|</a></li>
        <li><a href="">关于我们|</a></li>
        <li><a href="">产品展示|</a></li>
        <li><a  href="">新闻中心|</a></li>
        <li><a  href="">联系我们|</a></li>
    </ul>
</div>
<script>

    var a=document.getElementById("footnav");
    var b=a.firstElementChild.firstChild;
    console.log(b);
    console.log(typeof(b));
    var c = "首页";
    console.log(typeof (c));
    console.log(c);
    var lastelement = a.lastElementChild;
    var abq=lastelement.children;
    var lastelementintexe=lastelement.innerText;
    var replaceok  =lastelementintexe.replace("|","");
    abq[0].innerText=replaceok;

</script>