为什么我后面的这些代码都有问题？
<!DOCTYPE html>
<html>
<head>
<title>:first过滤选择器</title>
<script src="http://libs.baidu.com/jquery/1.9.0/jquery.js" type="text/javascript"></script>
<link href="style.css" rel="stylesheet" type="text/css" />
</head>
<body>
<div>改变最后一行"苹果"背景颜色：</div>
<div>
<ol id="test">
<li id="test1">葡萄</li>
<li id="test1">香蕉</li>
<li id="test1">橘子</li>
<li id="test1">西瓜</li>
<li id="test1">苹果</li></ol>
</div>
<div>
<ol id="test">
<li id="test1">葡萄</li>
<li id="test1">香蕉</li>
<li id="test1">橘子</li>
<li id="test1">西瓜</li>
<li id="test1">苹果</li></ol>
</div>
<div><ol id="test">
<li id="test1">葡萄</li>
<li id="test1">香蕉</li>
<li id="test1">橘子</li>
<li id="test1">西瓜</li>
<li id="test1">苹果</li></ol>
</div>
<script type="text/javascript">
//$("div:first").css("background-color", "red");
//$("ol:last").css("background-color", "red");
$("div:last").css("background-color", "red");
$("div:last").css("background-color", "red");
$("#test:last").css("background-color", "red");
$("#test1:last").css("background-color", "red");
</script>
</body>
</html>
陌卍言
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