<form name="forma">
<select name=mailSelect>
<option>请选择</option>
<option value="form1">form1</option>
<option value="form2">form2</option>
<option value="form3">form3</option>
<option value="form4">form4</option>
</select>
<input type=reset>
</form>
<select name=mailSelect>
<option>请选择</option>
<option value="form1">form1</option>
<option value="form2">form2</option>
<option value="form3">form3</option>
<option value="form4">form4</option>
</select>
<input type=reset>
</form>
{
for (var i=e.options.length; i>0; i--)
e.remove(i);
}