EventTarget接口：https://developer.mozilla.org/en-US/docs/Web/API/EventTarget。
Event 接口：https://developer.mozilla.org/en-US/docs/Web/API/Event。
//目录结构
demo/
index.html
script.js
//index.html
<!doctype html>
<html>
<body>
<p id="demo">Hello</p>
<button type="button" id="myBtn">Click</button>
<script src="script.js"></script>
</body>
</html>
//script.js
function sayHello() {
document.getElementById("demo").innerHTML = "Hello World";
}
let btn = document.getElementById("myBtn");
btn.addEventListener("click", sayHello);原创文章，作者：huoxiaoqiang，如若转载，请注明出处：https://www.huoxiaoqiang.com/javascript/htmlcss/38431.html
