<html><head><script src="https://libs.baidu.com/jquery/2.1.4/jquery.min.js"></script><script>$(document).ready(function(){ $("button").click(function(){ alert($("input:text").val()); });});</script></head><body>Firstname: <input type="text" name="fname" value="Peter"><br>Lastname: <input type="text" name="lname" value="Griffin"><br><br><button>Return the value of the first input field</button></body></html>