直接配合前面的后台程序,就可以实现跨域抓取天气信息了.
<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<script language="JavaScript" type="text/javascript">
function $() {
return document.getElementById(arguments[0])
}
function btnSty(objId,objStyle)
{
$(objId).style.display = objStyle
}
//提示窗口控制
function ifodis(){
btnSty('loadifo','none');
}
function settime(a){
setTimeout(a,1000);
}
function loadtime(){
$("loadifo").innerHTML += "."
}
//XML数据绑定
var xmldoc = false;
function loadurl(n){
//生成随机数，同时限制刷新次数
var now=new Date();
var Num=now.valueOf();
//定义往址参数
url = "weather.asp?n="+n+"&id="+Num;
//定义为异步传输模式
xmldoc = false;
//Mozill,Safari等浏览器时需要创建的XMLHttp类
if(window.XMLHttpRequest){
xmldoc = new XMLHttpRequest();
if(xmldoc.overrideMimeType){
xmldoc.overrideMimeType('text/xml');
}
}
//IE浏览器时创建的XMLHttp类
else if(window.ActiveXObject){
try{
xmldoc = new ActiveXObject("Msxml3.XMLHTTP");
}
catch(e){
try{
xmldoc = new ActiveXObject("Msxml2.XMLHTTP");
}
catch(e){
try{
xmldoc = new ActiveXObject("Microsoft.XMLHTTP");
}
catch(e){}
}
}
}
//不能创建XMLHTTP类时返回
if(! xmldoc){
return false;
}
//调用CheckState函数
xmldoc.onreadystatechange = CheckState;
xmldoc.open('GET',url,true);
xmldoc.send(null);
}
//状态检测
function CheckState(){
btnSty('loadifo','')
//收到完整的服务器响应
if(xmldoc.readyState == 1){
$("loadifo").innerHTML = "连接服务器"
}
else if(xmldoc.readyState == 2){
$("loadifo").innerHTML = "开始加载数据"
}
else if(xmldoc.readyState == 3){
$("loadifo").innerHTML = "正在加载数据"
settime(loadtime)
}
else if(xmldoc.readyState == 4){
//HTTP服务器响应值成功
if(xmldoc.status == 200){
//将服务器返回的字符串写到页面中ID为showdiv的区域
$("loadifo").innerHTML = "加载完成"
var response = xmldoc.responseText;
settime(ifodis)
$("prolist").innerHTML = response;
}
else{
$("loadifo").innerHTML = "错误"+xmldoc.statusText+"请重新选择";
}
}
}
</script>
<style type="text/css">
<!--
body {
margin: 0px;
padding: 0px;
font-size: 9pt;
}
-->
</style>
</head>
<body onload="loadurl('CHXX0138')">
<div>
<select onchange="loadurl(this.value)">
<option value="CHXX0138" selected="selected">武汉</option>
<option value="CHXX0097">南昌</option>
<option value="CHXX0502">海口</option>
<option value="CHXX0008">北京</option>
<option value="CHXX0116">上海</option>
<option value="CHXX0037">广州</option>
<option value="CHXX0259">银川</option>
<option value="CHXX0165">郑州</option>
<option value="CHXX0013">长沙</option>
<option value="CHXX0390">杭州</option>
<option value="CHXX0049">香港</option>
<option value="CHXX0146">西安</option>
<option value="CHXX0016">成都</option>
<option value="CHXX0110">青岛</option>
<option value="CHXX0039">贵阳</option>
<option value="CHXX0064">济南</option>
<option value="CHXX0448">合肥</option>
<option value="CHXX0031">福州</option>
<option value="CHXX0099">南京</option>
<option value="ITXX0042">米兰</option>
</select>
<span id="loadifo"></span></div>
<div id="prolist"></div>
</body>
</html>
