highlightPage函数改进

<ul id="navigation" class="nav-top">
            <li><a class="current" href="index.html">首&nbsp;&nbsp;页</a></li>
            <li><a href="zxzx.html">最新资讯</a></li>
            <li><a href="yjts.html">预警提示</a></li>
            <li><a href="zhfw.html">展会服务</a></li>
            <li><a href="zthd.html">专题活动</a></li>
            <li><a href="hdjl.html">互动交流</a></li>
        </ul>

function highlightPage() {
    var nav = document.getElementById("navigation");
    var links = nav.getElementsByTagName("a");
    for (var i = 0; i < links.length; i++) {
        var linkurl = links[i].getAttribute("href");
        var currenturl = window.location.href;
        if (currenturl.indexOf(linkurl) != -1) {
            links[0].className = "";
            links[i].className = "current";
            var linktext = links[i].lastChild.nodeValue.toLowerCase();
            document.body.setAttribute("id", linktext);
        }
    }
}

links[0].className = "";

用于消除进入首页是无index.html后缀导致标签样式显示不出来。