W3School TIY Editor
W3School 在线教程
改变方向
暗黑模式
运行代码
<!DOCTYPE html> <html> <body> <p>本例使用 addEventListener() 方法将 "mouseover" 和 "mouseout" 事件附加到 h1 元素。</p> <h1 id="demo">请把鼠标悬停在我上面</h1> <script> document.getElementById("demo").addEventListener("mouseover", mouseOver); document.getElementById("demo").addEventListener("mouseout", mouseOut); function mouseOver() { document.getElementById("demo").style.color = "red"; } function mouseOut() { document.getElementById("demo").style.color = "black"; } </script> </body> </html>