不知道用锚点行不行?
<select name="aaa" onChange="window.location.href='aaa.html#aaa'">
或者
<select name="aaa" onChange="window.location.href='#aaa'">你试试看看
<select name="aaa" onChange="window.location.href='aaa.html#aaa'">
或者
<select name="aaa" onChange="window.location.href='#aaa'">你试试看看
<option value="#top">top</option>
<option value="#r1">r1</option>
<option value="#r2">r2</option>
</select>
....
<a name="r1"></a>
....
<a name="r2"></a>
str = "从数据库读出来";
onchange="div1.innerHTML=str";