xxxxxxxxxx<html><head><meta charset="utf-8"><title>W3Cschool教程(w3cschool.cn)</title></head><body><p>该实例使用 addEventListener() 方法在按钮中添加点击事件。 </p><button id="myBtn">点我</button><script>document.getElementById("myBtn").addEventListener("click", function(){ alert("Hello World!");});</script></body></html>