javascript - 如何在动态数组中存储更新的股票数据

Question

我正在使用ajax和php从雅虎财经获取实时值(value)，即ftse。我想以数组格式存储所有值，并希望比较最后 2 个最近更新的值。

以下是我的javascript:

<script>
function loadXMLDoc()
{
    var xmlhttp;
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
  xmlhttp=new XMLHttpRequest();
}
else
{// code for IE6, IE5
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
document.getElementById("myDiv").innerHTML=xmlhttp.responseText;
}
}
xmlhttp.open("GET","ftse.php",true);
xmlhttp.send();
}
setInterval(loadXMLDoc,1000);
</script>

以下是我的php代码。

<div id="myDiv">


<?php
// Setup Variables
$stockList = "^ftse";
$f = "l1";
$host = "http://finance.yahoo.com/d/quotes.csv";
$requestUrl = $host."?s=".$stockList."&f=".$f."&e=.csv";

// Pull data (download CSV as file)
$filesize=2000;
$handle = fopen($requestUrl, "r");
$raw = fread($handle, $filesize);
fclose($handle);

// Split results, trim way the extra line break at the end
$quotes = explode("\n\n",trim($raw));

foreach($quotes as $quoteraw) {
$quoteraw = str_replace(", I", " I", $quoteraw);
$quote = explode(",", $quoteraw);

// output the first element of the array, the Company Name
}


echo "<br><center><font size='30' color='green'>".$raw."<br>";


?>

</div>

以下是我的ftse.php代码。

<?php
// Setup Variables
$stockList = "^ftse";
$f = "l1";
$host = "http://finance.yahoo.com/d/quotes.csv";
$requestUrl = $host."?s=".$stockList."&f=".$f."&e=.csv";

// Pull data (download CSV as file)
$filesize=2000;
$handle = fopen($requestUrl, "r");
$raw = fread($handle, $filesize);
fclose($handle);

// Split results, trim way the extra line break at the end
$quotes = explode("\n\n",trim($raw));

foreach($quotes as $quoteraw) {
$quoteraw = str_replace(", I", " I", $quoteraw);
$quote = explode(",", $quoteraw);

// output the first element of the array, the Company Name
}

echo "<br><center><font size='30' color='green'>".$raw."<br>";

？>

问题是，如果该值较小，则应以红色打印，如果较大，则应以绿色打印。

Answer 1

元素上没有属性color。您想要设置一个样式以将颜色设置为绿色，因此您可以编写:

echo "<br><center><font size='30' style='color=green'>".$raw."<br>";

理想情况下你不会这样做，因为它只会污染 DOM。用类进行注释:

echo "<br><center><font size='30' class='up'>".$raw."<br>";
echo "<br><center><font size='30' class='down'>".$raw."<br>";

然后在你的 CSS 文件中你就有:

.up {
  color: green
}

.down {
  color: red
}

同时，还将字体大小和其他样式装饰移动到 CSS。

我希望这会有所帮助。