问个比较急的问题，解决马上给分！关于id="javascript:eval('opt_' + <%= j%>)"表示法

是不是就是连接字符串啊？？
<ul id=<%= "opt_" + j%>

解决方案 »

免费领取超大流量手机卡，每月29元包185G流量+100分钟通话, 中国电信官方发货

这样也不行，因为函数在onload就执行，所以这些表达式优先级比较低，当执行函数时就报错找不到对象
<script language="javascript" type="text/javascript">
document.getElementsByClassName = function(cl) {
  var retnode = [];
  var myclass = new RegExp('\\b'+cl+'\\b');
  var elem = this.getElementsByTagName('*');
  for (var j = 0; j < elem.length; j++) {
   var classes = elem[j].className;
   if (myclass.test(classes)) retnode.push(elem[j]);
  }
  return retnode;
}

function HideAll() {
  var items = document.getElementsByClassName("optiton");
  for (var j=0; j<items.length; j++) {
   items[j].style.display = "none";
  }
}

window.onload = function() {
  var show_item = "opt_1";
  document.getElementById(show_item).style.display = "none";
  var items = document.getElementsByClassName("title");
  for (var j=0; j<items.length; j++) {
   items[j].onclick = function() {
    var o = document.getElementById("opt_" + this.name);
    if (o.style.display != "block") {
     HideAll();
     o.style.display = "block";
    }
    else {
     o.style.display = "none";
    }
   }
  }
}
</script>
<li class="item"><a href="javascript:void(0)" class="title" name="1">中心概况</a>
  <ul id="opt_1" class="optiton">
          <li><a href="introduce/introduce_content.jsp?cmodel=info_zxgk&cid=33">中心介绍</a></li>
          <li><a href="introduce/introduce_content.jsp?cmodel=info_zxgk&cid=34">组织架构</a></li>
          <li><a href="introduce/introduce_content.jsp?cmodel=info_zxgk&cid=35">发展足迹</a></li>
  <li><a href="introduce/introduce_content.jsp?cmodel=info_zxgk&cid=36">企业文化</a></li>
  <li><a href="introduce/introduce_content.jsp?cmodel=info_zxgk&cid=37">专业创业园</a></li>
          </ul>
          </li>
javascript里使用 <%%>两边要加引号的
<body onload="test(<%= "opt_" + j%>)">
function test(aaa) {
  var show_item = aaa;
  document.getElementById(show_item).style.display = "none";
  var items = document.getElementsByClassName("title");
  for (var j=0; j<items.length; j++) {
   items[j].onclick = function() {
    var o = document.getElementById("opt_" + this.name);
    if (o.style.display != "block") {
     HideAll();
     o.style.display = "block";
    }
    else {
     o.style.display = "none";
    }
   }
  }
}
测试了一下，没有问题哎~
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title></title>
<%
Dim i
i = 1
%>
<script type="text/javascript">
window.onload = function()
{
var name = "test" + "<%=i%>";
alert(document.all(name));
}
</script>
</head>
<body>
<ul id="test<%=i%>" name="test<%=i%>">
</ul>
</body>
<ul id="opt_<%= j%>">