js模拟权限选择实现代码(select操作)

<meta http-equiv="Content-Type" content="text/html;charset=UTF-8"> <title></title> <select id="selnum1" multiple><option>添加 </option> <option>修改 </option> <option>删除 </option> <option>保存 </option></select><input type="button" name="name" value=">>" onclick="movealloptions(document.getelementbyid('selnum1'),document.getelementbyid('selnum2'));"><input type="button" name="name" value=">" onclick="moveselectedoptions(document.getelementbyid('selnum1'),document.getelementbyid('selnum2'));"><input type="button" name="name" value="<" onclick="moveselectedoptions(document.getelementbyid('selnum2'),document.getelementbyid('selnum1'));"><input type="button" name="name" value="<<" onclick="movealloptions(document.getelementbyid('selnum2'),document.getelementbyid('selnum1'));"><select id="selnum2" multiple></select>
[ctrl+a 全选 注:引入外部js需再刷新一下页面才能执行]