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>