代码如下:<FORM METHOD=POST ACTION="open_new_tag.htm" target="_blank">
<select onchange="this.form.submit();">
<option name="xx">1</option>
<option name="xx">2</option>
<option name="xx">3</option>
<option name="xx">4</option>
<option name="xx">5</option>
</select>
</FORM>
<select onchange="this.form.submit();">
<option name="xx">1</option>
<option name="xx">2</option>
<option name="xx">3</option>
<option name="xx">4</option>
<option name="xx">5</option>
</select>
</FORM>
如果相等,将selected此项。