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JS 参考手册
onmouseenter 事件
tryjsref_onmouseenter_addeventlistener
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<!DOCTYPE html> <html> <body> <p>此示例使用 addEventListener() 方法将“mouseenter”和“mouseleave”事件附加到 h1 元素。</p> <h1 id="demo">鼠标悬停在我身上</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>