在进行form提交时，根据form的选择，在javascript中进行特定提交

1.html代码片段
<form name="form1" method="post" action="">
  <select name="select1">
    <option value="a.htm" selected>a.htm</option>
    <option value="b.htm">b.htm</option>
    <option value="c.htm">c.htm</option>
    <option value="d.htm">d.htm</option>
  </select>
  <input type="submit" value="提交" onClick="chkaction()">
</form>

2.javascript代码片段
<script language="javascript">
function chkaction()
{
    form1.action = form1.select1.options[form1.select1.selectedIndex].value;
    document.form1.submit();
}
</script>