1. http://www.weather.com.cn/data/sk/101010100.html
2. http://www.weather.com.cn/data/cityinfo/101010100.html
3. http://m.weather.com.cn/data/101010100.html
<?php
header("Content-Type:text/html;charset=utf-8");
?>
<html>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
<head>
<title>weather forecast</title>
<script type="text/javascript" src="ajax.js"></script>
<script type="text/javascript">
function $(id){
return document.getElementById(id);
}
function getCityId(){
var http_request=createAjax();
var url="weatherforecast.php"
var data="cityid="+$("cityId").value;
http_request.onreadystatechange=getWetherInfo;
http_request.open("
post",url,true);
http_request.setRequestHeader("Content-type","application/x-www-form-urlencoded");
http_request.send(data);
function getWetherInfo(){
if(http_request.readyState==4 && http_request.status==200){
var info=http_request.responseText;
$("weatherinfo").innerHTML=info;
}
}
}
</script>
</head>
<body>
<select name="cityId" onchange="getCityId();" id="cityId">
<option>--请选择城市--</option>
<option value="101010100">
北京</option>
<option value="101020100">
上海</option>
<option value="101030100">
天津</option>
<option value="101040100">
重庆</option>
<option value="101280101">广州</option>
</select>
<span id="weatherinfo"></span>
</body>
</html>