<html>
<head>
????<title>lalala</title>
????<script?type="text/javascript"?src="jquery-3.1.1.min.js"></script>
</head>
<body>
????<span>a1</span>
????<span>a2</span>
????<span>a3</span>
????<script></script>
</body>
????<script></script>
????<script?type="text/javascript">
????$('span:nth-last-child(3)').css("color",?"red");
????</script>
</html>
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