多选下拉框数据操作
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><HTML> <HEAD> <TITLE> New Document </TITLE> <META NAME="Generator" CONTENT="EditPlus"> <META NAME="Author" CONTENT=""> <META NAME="Keywords" CONTENT=""> <META NAME="Description" CONTENT=""> </HEAD><script language="javascript">function leftMove(){var mailSelect1 = document.getElementById("mailSelect1");var mailSelect2 = document.getElementById("mailSelect2");for(var i=0;i<mailSelect2.options.length;i++){if(mailSelect2.options[i].selected){var opt = document.createElement("option");opt.value = mailSelect2.options[i].value;opt.text = mailSelect2.options[i].text;mailSelect1.add(opt);mailSelect2.options.removeChild(mailSelect2.options[i--]);}}}function leftMoveAll(){var mailSelect1 = document.getElementById("mailSelect1");var mailSelect2 = document.getElementById("mailSelect2");for(var i=0;i<mailSelect2.options.length;i++){var opt = document.createElement("option");opt.value = mailSelect2.options[i].value;opt.text = mailSelect2.options[i].text;mailSelect1.add(opt);mailSelect2.options.removeChild(mailSelect2.options[i--]);}}function rightMove(){var mailSelect1 = document.getElementById("mailSelect1");var mailSelect2 = document.getElementById("mailSelect2");for(var i=0;i<mailSelect1.options.length;i++){if(mailSelect1.options[i].selected){var opt = document.createElement("option");opt.value = mailSelect1.options[i].value;opt.text = mailSelect1.options[i].text;mailSelect2.add(opt);mailSelect1.options.removeChild(mailSelect1.options[i--]);}}}function rightMoveAll(){var mailSelect1 = document.getElementById("mailSelect1");var mailSelect2 = document.getElementById("mailSelect2");for(var i=0;i<mailSelect1.options.length;i++){var opt = document.createElement("option");opt.value = mailSelect1.options[i].value;opt.text = mailSelect1.options[i].text;mailSelect2.add(opt);mailSelect1.options.removeChild(mailSelect1.options[i--]);}}</script> <BODY><center><table><tr><td><select name="mailSelect1" multiple><option value="form1">form1</option> <option value="form2">form2</option> <option value="form3">form3</option> <option value="form4">form4</option> </select></td><td><input type="button" value="<" onclick="leftMove()"/><input type="button" value=">" onclick="rightMove()"/><input type="button" value="<<" onclick="leftMoveAll()"/><input type="button" value=">>" onclick="rightMoveAll()"/></td><td><select name="mailSelect2" multiple><option value="a">--a--</option> <option value="b">--b--</option> <option value="c">--c--</option> <option value="d">--d--</option> </select></td></tr><table></center> </BODY></HTML>