<html><body><h1>JavaScript addEventListener()</h1><p>Internet Explorer 8 及更早版本不支持 addEventListener() 方法。</p><p>此例演示了适用于所有浏览器的解决方案。</p><button id="myBtn">试一试</button><script>var x = document.getElementById("myBtn");if (x.addEventListener) { x.addEventListener("click", myFunction);} else if (x.attachEvent) { x.attachEvent("onclick", myFunction);}function myFunction() { alert("Hello World!");}</script></body></html>