$(function() {
$("span").click(function(e) {
alert("Bonjour fermier !");
});
});
<!DOCTYPE html>
<html>
<head>
<title>LaFermeDuWeb</title>
<meta charset="utf-8" />
</head>
<body>
<span>Hello world !</span>
</body>
</html>
span
{
color: red;
}