请问如何实现点击下拉框的内容使页面重定位?

Question

<select onchange="if(this.value!='')window.location.href=this.value">
  <option>请选择</option>
  <option value="a.htm">a.htm</option>
  <option value="b.htm">b.htm</option>
  <option value="c.htm">c.htm</option>
  <option value="d.htm">d.htm</option>
</select>

Answer 1

<select onchange="javascript:
window.location='cjjb_step2.php?id=' + id + '&bid_for_id=' + bid_for_id + '&page=' + selObj.options[selObj.selectedIndex].value;">
  <option>请选择</option>
  <option value="a.htm">a.htm</option>
  <option value="b.htm">b.htm</option>
  <option value="c.htm">c.htm</option>
  <option value="d.htm">d.htm</option>
</select>