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JS 参考手册
onmouseover 事件
tryjsref_onmouseover_dom
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<!DOCTYPE html> <html> <body> <p>此示例使用 HTML DOM 将“onmouseover”和“onmouseout”事件分配给 h1 元素。</p> <h1 id="demo">鼠标悬停在我身上</h1> <script> document.getElementById("demo").onmouseover = function() {mouseOver()}; document.getElementById("demo").onmouseout = function() {mouseOut()}; function mouseOver() { document.getElementById("demo").style.color = "red"; } function mouseOut() { document.getElementById("demo").style.color = "black"; } </script> </body> </html>