<html><head><script src="https://libs.baidu.com/jquery/2.1.4/jquery.min.js"></script><script>$(document).ready(function(){ $("button").click(function(){ $("#span1").text($(window).height()); $("#span2").text($(document).height()); });});</script></head><body><p>The height of this window is <span id="span1">unknown</span> px.</p><p>The height of this document is <span id="span2">unknown</span> px.</p><button>Return the height of the window and document elements</button></body></html>