<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").text()); });});</script></head><body><button>Return the text content of all p elements</button><p>This is a paragraph.</p><p>This is <b>another</b> paragraph.</p></body></html>