我想实现:
当选择 Other 时,显示一个 Input框出来,供其自行输入.
该如何写? 谢谢

<select name="City" class="int">
<option value="Shanghai"<%=selected(rs("City"),"Shanghai")%>>Shanghai</option>
<option value="Beijing"<%=selected(rs("City"),"Beijing")%>>Beijing</option>
<option value="Other">Other</option>
</select>

<script> function changeinputmode(o,n){ document.getElementById(o).style.display="block" document.getElementById(o).removeAttribute("disabled") document.getElementById(n).style.display="none" document.getElementById(n).setAttribute("disabled","true") } </script> <select name="City" class="int" id="normalinput" onchange="if(this.value=='Other')changeinputmode('otherinput','normalinput')"> <option value="Shanghai"<%=selected(rs("City"),"Shanghai")%>>Shanghai</option> <option value="Beijing"<%=selected(rs("City"),"Beijing")%>>Beijing</option> <option value="Other">Other</option> </select><input id="otherinput" name=City disabled="disabled" style="display:none; float:left" /><input value="toselect" type="button" onclick="changeinputmode('normalinput','otherinput')" />
 提示：您可以先修改部分代码再运行

正好有一个

<form action="#" method="post"> <select id="v1" name="yuanyin" onchange="if (this.value=='其它'){this.form.elements['v2'].style.display='inline'}else{this.form.elements['v2'].style.display='none'}"> <option value="1">1</option> <option value="2">2</option> <option value="3">3</option> <option value="4">4</option> <option value="其它">其它</option> </select> <input name="v2" style="display:none" onblur="if(this.value!=''){document.getElementById('v1').options.add(new Option(this.value,this.value));this.style.display='none';document.getElementById('v1')[document.getElementById('v1').length-1].selected=true}"> </form>
 提示：您可以先修改部分代码再运行