📄 25.3.htm
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<!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=gb2312">
<title>JavaScript Ref News</title>
</head>
<body>
<h2>JavaScript World News Report</h2>
<form name="newsform" id="newsform" action="#" method="get">
Show me
<input type="text" name="numstories" id="numstories" size="1" value="5">
stories every
<input type="text" name="howoften" id="howoften" size="2" value="5">
minutes.
<input type="button" value="Get News" onclick="updateNews();">
</form>
<hr>
<div id="news">Fetching news stories...</div>
<br>
<script type="text/javascript">
<!--
var commandURL = "http://demos.javascriptref.com/getnews.php?";
//发送URL中给出的RPC 。服务器将返回携带所需操作的JavaScript。
function sendRPC(url)
{
var newScript = document.createElement('script');
newScript.src = url;
newScript.type = "text/javascript";
document.body.appendChild(newScript);
}
// 通过发送RPC从服务器获取新闻信息。
// RPC发送后，设置一个计时器来定时更新新闻信息
function updateNews()
{
var params = "numstories=" + document.newsform.numstories.value;
sendRPC(commandURL + params);
var checkAgain = 5 * 60 * 1000; // 默认为5分钟
if (parseInt(document.forms.newsform.howoften))
checkAgain = parseInt(document.forms.newsform.howoften) * 60 * 1000;
setTimeout(updateNews, checkAgain);
}
updateNews(); //更新新闻信息
//-->
</script>
</body>
</html>
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