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<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.bootcss.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>
<script>
$(document).ready(function(){
    $("p:first").css("background-color", "yellow");
});
</script>

<script>
var _hmt = _hmt || [];
(function() {
var hm = document.createElement("script");
hm.src = "//hm.baidu.com/hm.js?73c27e26f610eb3c9f3feb0c75b03925";
var s = document.getElementsByTagName("script")[0];
s.parentNode.insertBefore(hm, s);
})();
</script>
</head>
<body>

<p>This is the first paragraph.</p>
<p>This is the second paragraph.</p>
<p>This is the last paragraph.</p>

</body>
</html>