我编写了一个从网页中提取特定表格的代码。该网站是动态的,它每半小时更新一次表中的值。我的用于解析网站的Javascript每30分钟重新加载一次网站。但是作为JSON提取的数据只是特定时间的数据。但是,我希望每次网站重新加载时附加或连接所有数据(即,我需要与先前列表连接的当前数据列表,只要程序正在运行)我该怎么做?
网页为:https://www.emcsg.com/marketdata/priceinformation
所需表格是:查看72个期间
我的代码如下:
<html>
<head>
<title>Pricing </title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.4/jquery.min.js" type="text/javascript"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script type="text/javascript" src="https://github.com/douglascrockford/JSON-js/raw/master/json2.js"></script>
<meta http-equiv="refresh" content="1800" /><!--Reloads page every 30 minutes-->
<script>
function requestCrossDomain(site, callback) {
if (!site) {
alert('No site was passed.');
return false;
}
var yql = 'http://query.yahooapis.com/v1/public/yql?q=' + encodeURIComponent('select * from html where url="' + site + '"') + '&format=xml&callback=?';
$.getJSON(yql, cbFunc);
function cbFunc(data) {
if (data.results[0]) {
data = data.results[0].replace(/<script[^>]*>[\s\S]*?<\/script>/gi, '');
window[callback](data);
} else throw new Error('Nothing returned from getJSON.');
}
}
var url = 'https://www.emcsg.com/marketdata/priceinformation';
requestCrossDomain(url, 'someFunction');
function someFunction(results){
var html = $(results);
var table = html.find(".view72PeriodsWrapper");
$('#loadedContent').css("display","").html(table);
}
</script>
</head>
<body>
<br><br>
<div id="result"></div>
<div id="loadedContent"></div>
</body>
</html>