<html>
<head>
<script src="https://libs.baidu.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("p:nth-child(odd)").css("background-color","yellow");
$("p:nth-child(even)").css("background-color","pink");
});
</script>
</head>
<body>
<p>The first p element in body, and the first child in body (odd).</p>
<p>The last p element in body, and the last child in body (even).</p>
<div style="border:1px solid;">
<span>This is a span element, the first child in div.</span>
<p>The first p element in div, and the second child in div (even).</p>
<p>The second p element in div, and the third child in div (odd).</p>
<p>The third p element in div, and the fourth child in div (even).</p>
<p>The last p element in div, and the last child in div (odd).</p>
</div><br>
<div style="border:1px solid;">
<p>The first p element in another div, and the first child in another div (odd).</p>
<p>The second p element in another div, and the second child in another div (odd).</p>
<p>The third p element in another div, and the third child in another div (odd).</p>
<p>The last p element in another div, and the last child in another div (odd).</p>
</div>
</body>
</html>