Ajax添加省份到下拉框里

一、jsp页面

<select name="province" >
<option>请选择省份：</option>
</select>

$(function(){
//第一步：创建XMLHttpRequest对象
var xmlhttp;
if (window.XMLHttpRequest){
xmlhttp=new XMLHttpRequest();
}
else{
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
//第二步：调用open()
xmlhttp.open("GET","${pageContext.servletContext.contextPath}/cityServlet.do?method=chooseCity",true);
//第三步：调用send()
xmlhttp.send();
//第四步
xmlhttp.onreadystatechange = function(){
if (xmlhttp.readyState==4){
if(xmlhttp.status==200){
var city = xmlhttp.responseText;
var provinces = city.split(",");
for(var i = 0 ; i<provinces.length-1 ; i=i+2){
var opt = new Option(provinces[i+1],provinces[i]);
$("select[name='province']").append(opt);
}
}else{
alert("错误");
}
}
};
});

二、CityServlet.java(继承HttpServlet、重写方法、配置xml)

response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
out.print("01,山西,02,山东,03,河北");