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javascript select控件间内容互相移动

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>Insert title here</title> </head> <body>  <body> <table width="27%" height="194" border="0" cellpadding="1" cellspacing="0"> <tr> <td width="21%"><select id="selectfrom" size="15" multiple="multiple" style="width:100px"> <option>a</option> <option>b</option> <option>c</option> <option>d</option> <option>e</option> <option>f</option> <option>g</option> <option>h</option> <option>i</option> <option>j</option> <option>k</option> <option>j</option> <option>m</option> <option>n</option> </select></td> <td width="57%"><p align="center"> <input name="addAll" type="button" id="addAll" value=" >> " style="width:40px" onclick="addAll()"/> </p> <p align="center"> <input name="add" type="button" id="add" style="width:40px" value=" > " onclick="add()"/> </p> <p align="center"> <input name="del" type="button" id="del" value=" < " style="width:40px" onclick="del()"/> </p> <p align="center"> <input name="delAll" type="button" id="delAll" value=" << " style="width:40px" onclick="delAll()"/> </p></td> <td width="22%"><select id="select2" size="15" multiple="multiple" style="width:100px"> </select></td> </tr> </table> </body> </html>

[Ctrl+A 全选注:引入外部Js需再刷新一下页面才能执行]

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