js实现分页列表添加样式

<script>
        var dUrl=window.location.href;
        var cUrl=(dUrl.substring(0, dUrl.indexOf('list_')));
        var fUrl=(dUrl.substring(0, dUrl.indexOf('index.html')));
        var oUrl=document.getElementById("w_lwnav");
        var aUrl=oUrl.getElementsByTagName("a");
        for(var i=0;i<aUrl.length;i++){
        if(aUrl[i].href==dUrl||aUrl[i].href==cUrl||aUrl[i].href==fUrl){
        aUrl[i].className="on";
        }else{
        }
        }
</script>