<html><body><h2>JavaScript addEventListener()</h2><p>此示例使用 addEventListener() 方法将两个单击事件添加到同一个按钮。</p><button id="myBtn">试一试</button><script>var x = document.getElementById("myBtn");x.addEventListener("click", myFunction);x.addEventListener("click", someOtherFunction);function myFunction() { alert ("Hello World!");}function someOtherFunction() { alert ("这个函数也执行了！");}</script></body></html>