<html><head> <title> 网页名称 </title></head><body><select name="a" id="selecta" size="5" multiple="multiple" ondblclick="ltor()"><option>a</option><option selected="selected">b</option><option>c</option><option>d</option><option>e</option><option>f</option></select><select name="b" id="selectb" size="5" multiple="multiple" ></select><script type="text/javascript">function ltor(){ var a = document.getElementById("selecta"); var ao = a.options; var b = document.getElementById("selectb"); var bo = b.options; for(var ii=0; ii<ao.length; ii++) { if(ao[ii].selected) bo[bo.length] = new Option(ao[ii].text,ao[ii].value); }}</script></body></html>
