css实现div在下拉菜单之上

!DOCTYPE htML PubLIC "-//W3C//DTD XHTML 1.0 TransITional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> html XMlns="http://www.w3.org/1999/xhtml"> head> meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> title> div在下拉菜单之上/title> style type="text/css"> div{ position:absolute; top:100px; left:100px; z-index:2; height:200px; width:200px; background:#f0c} iframe{ position:absolute; top:0; left:0; z-index:1; background:#CF0} select{ width:100%} /style> /head> body> div> /div> iframe> 1212/iframe> select> option> /option> /select> select> option> /option> /select> select> option> /option> /select> select> option> /option> /select> select> option> /option> /select> select> option> /option> /select> select> option> /option> /select> select> option> /option> /select> select> option> /option> /select> select> option> /option> /select> select> option> /option> /select> select> option> /option> /select> /body> /html>
ffcod = delpost.runcode1 .value; ffcod = ffcod.replace(/
/g,''); delpost.runcode1 .value = ffcod; 提示：您可以先修改部分代码再运行

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