<script type="text/javascript">
function changeval(val)
{
if (val=="3")
{
showselect.style.display="";
}
else
{
showselect.style.display="none";
}
}
</script><select name="select" onchange="javascript:changeval(this.value);">
<option value="1">test </option>
<option value="2">test1 </option>
<option value="3">test2 </option>
</select><div id="showselect" style="display:none;">
<select name="select2">
<option value="1">出现 </option>
<option value="2">出现2 </option>
</select>
</div>
function changeval(val)
{
if (val=="3")
{
showselect.style.display="";
}
else
{
showselect.style.display="none";
}
}
</script><select name="select" onchange="javascript:changeval(this.value);">
<option value="1">test </option>
<option value="2">test1 </option>
<option value="3">test2 </option>
</select><div id="showselect" style="display:none;">
<select name="select2">
<option value="1">出现 </option>
<option value="2">出现2 </option>
</select>
</div>
解决方案 »
免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货