1.网址：
http://www.cnblogs.com/Herist/archive/2007/09/24/903890.html
http://www.cnblogs.com/xiangpiaopiao2011/archive/2011/06/15/2081580.html
2.代码总结
<!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>
<title>第一个简单的jQuery程序</title>
<script language="javascript" type="text/javascript"
src="Jscript/jquery-1.4.2.min.js"></script>
<script type="text/javascript">
var selectIndex='1';
/*获取选择的value*/
function clickSelect(){
selectIndex="1";
var obj = document.getElementById("select");
selectIndex = obj.selectedIndex;
}
function changeSelect(){
var selectVal = $("#select").val(); //获取选中记录的value值
var selectText = $("#select option:selected").text(); //获取选中记录的text值
// alert(selectVal +":"+selectText);
//ajax
if(selectVal=='2'){//如果是2 需要提醒
var r=confirm("danger是否确认选择?");
if (r==true)
{
alert("更新成功");
}else{
var obj = document.getElementById("select");
obj.options[selectIndex].selected = true; //保持选中状态
}
}else{
}
}
</script>
</head>
<body>
<select id="select" onclick="clickSelect()" onchange="changeSelect()">
<option value="1">一</option>
<option value="2">二</option>
<option value="3">三</option>
<option value="4">四</option>
<option value="5">五</option>
<option value="6">六</option>
<option value="7">七</option>
<option value="8">八</option>
<option value="9">九</option>
</select>
</body>
</html>