JS左右栏目添加器 

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>水果选择</title>
</head>
<style type="text/css">
       select{
           width: 200px;
           height: 100px;
       }

</style>
<body>  
      <h1>水果选择：</h1>
       <select name="" id="left"  size="2">
                 <option>苹果</option>
                 <option>橘子</option>
                 <option>香蕉</option>
                 <option>西瓜</option>
                 <option>草莓</option>
       </select>
       <input type="button"  value=">>" name="" id="btn">
      <select name="" id="right" size="2"></select>
</body>
<script type="text/javascript">
        btn=document.getElementById('btn');
        left=document.getElementById('left');
        right=document.getElementById('right');
        opts=left.options;
        btn.onclick=function(){
              idx=left.selectedIndex;
              right.add(opts[idx]);
        }

</script>
</html>

 

posted @ 2016-06-06 23:04  骏码信息  阅读(307)  评论(0)    收藏  举报