打开新页
<form name="form1" method="post" action="">
<select name="select" id="select" onChange="javascript:window.open(this.value, '_blank');">
<option >更多</option>
<option value=">
<option value=">
<option value=">
</select>
</form>
本页跳转
<form name="form1" method="post" action="">
<select name="select" id="select" onChange="location.href=this.value;">
<option >更多</option>
<option value=">
<option value=">
<option value=">
</select>
</form>