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<!DOCTYPE html> <html> <body> <p>本例使用 HTML DOM 将 "onmouseenter" 和 "onmouseleave" 事件分配给 h1 元素。</p> <h1 id="demo">请把鼠标悬停在我上面</h1> <script> document.getElementById("demo").onmouseenter = function() {mouseEnter()}; document.getElementById("demo").onmouseleave = function() {mouseLeave()}; function mouseEnter() { document.getElementById("demo").style.color = "red"; } function mouseLeave() { document.getElementById("demo").style.color = "black"; } </script> </body> </html>