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代码编辑器：
<!DOCTYPE html> <meta charset="utf-8"> <link href="/static/next/css/tryit.css?v=2017082407" rel="stylesheet"/> <script src="https://cdn.staticfile.org/jquery/2.2.4/jquery.min.js"></script> <script> $(document).ready(function(){ $("input").keydown(function(){ $("input").css("background-color","lightblue"); }); $("input").keyup(function(){ $("input").css("background-color","lavender"); }); $("#btn1").click(function(){ $("input").keydown(); }); $("#btn2").click(function(){ $("input").keyup(); }); }); </script> <input type="text"> <p><button id="btn1">Trigger keydown event for input field</button></p> <p><button id="btn2">Trigger keyup event for input field</button></p> <footer>简单教程，简单编程<br/>Copyright © 简单教程 www.twle.cn</footer>
运行结果：