- <input type="button" id="btn" value="按钮"/>
- <select name="select" id="select">
- <option value="1">aa</option>
- <option value="a">bb</option>
- <option value="c">cc</option>
- </select>
- <script type="text/javascript">
- // 点击按钮, 让第二项选中
- document.getElementById(btn).onclick=function(){
- document.getElementById(select).value="a";
- }
- </script>
来源: http://www.bubuko.com/infodetail-2538021.html