url截取判断（实现同级列表）

<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>