<html><head><script src="https://libs.baidu.com/jquery/2.1.4/jquery.min.js"></script><script>$(document).ready(function(){ $("button").click(function(){ alert($("p").html()); });});</script></head><body><button>Return the content of the p element</button><p>This is a <b>paragraph</b>.</p></body></html>