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<!DOCTYPE html> <html> <body> <h1>Element 对象</h1> <h2>addEventListener() 方法</h2> <p>本例使用 addEventListener() 方法在同一个按钮上添加多个事件。</p> <button id="myBtn">试一试</button> <p id="demo"></p> <script> const element = document.getElementById("myBtn"); element.addEventListener("mouseover", myFunction); element.addEventListener("click", mySecondFunction); element.addEventListener("mouseout", myThirdFunction); function myFunction() { document.getElementById("demo").innerHTML += "Moused over!<br>" } function mySecondFunction() { document.getElementById("demo").innerHTML += "Clicked!<br>" } function myThirdFunction() { document.getElementById("demo").innerHTML += "Moused out!<br>" } </script> </body> </html>