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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>安科教程(www.ancii.com)</title> </head> <body> <p>该实例使用了 addEventListener() 方法向 h1 元素添加 "mouseenter" 和 "mouseleave" 事件。</p> <h1 id="demo">Mouse over me</h1> <script> document.getElementById("demo").addEventListener("mouseenter", mouseEnter); document.getElementById("demo").addEventListener("mouseleave", mouseLeave); function mouseEnter() { document.getElementById("demo").style.color = "red"; } function mouseLeave() { document.getElementById("demo").style.color = "black"; } </script> </body> </html>
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