使用href中的onclick更改选择列表的值

Question

我想使用onClick函数更改选择框值.

 <form>
      <select id="action">
         <option value="a">Add</option>
         <option value="b">Delete</option>
      </select>
 </form>

<a href="#" onClick="">Add</a> 
<a href="#" onClick="">Delete</a> 

Answer 1

 <form>
      <select id="action">
         <option value="a">Add</option>
         <option value="b">Delete</option>
      </select>
 </form>

<a href="#" onClick="document.getElementById('action').value='a'">Add</a> 
<a href="#" onClick="document.getElementById('action').value='b'">Delete</a> 

或者U也可以调用此Java Script函数来执行此操作=

function changeval()
{

if(document.getElementById('action').value =='b')
document.getElementById('action').value='a'
else
document.getElementById('action').value='b'

}

<a href="#" onClick="changeval()">Add</a> 
<a href="#" onClick="changeval()">Delete</a>