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");