DIV CSS 佈局教程網

雖然是個簡單的效果，還是需要積累一下，記錄一下；

源代碼如下所示：

<select id="myselect1">
 <option value="">— —</option>
 <option value="2015級">2015級</option>
 <option value="2014級">2014級</option>
 <option value="2013級">2013級</option>
 <option value="2012級">2012級</option>
</select><br><br>
<select id="myselect2">
 <option value="">— —</option>
 <option value="2015級">2015級</option>
 <option value="2014級">2014級</option>
 <option value="2013級">2013級</option>
 <option value="2012級">2012級</option>
</select>
 var time = new Date();
 var month=time.getMonth()+1;
 var day=time.getDay();
 if(month>5&&day>1){
  var objSelect=document.getElementById("myselect2");
  objSelect.options.add(new Option("2016級", "2016級"),1);
  objSelect.options.remove(5);
 }
 if(month>7&&day>1){
  var objSelect=document.getElementById("myselect1");
  objSelect.options.add(new Option("2016級", "2016級"),1);
  objSelect.options.remove(5);
 }