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<!DOCTYPE html> <html> <head> <style> div { width: 100px; height: 100px; border: 1px solid black; margin: 10px; float: left; padding: 30px; text-align: center; background-color: lightgray; } p { background-color: white; } </style> </head> <body> <h3>这个例子演示了 onmousemove、onmouseenter 和 onmouseover 之间的区别。</h3> <p>每次鼠标指针移到 div 元素上时都会发生 onmousemove 事件。</p> <p>mouseenter 事件仅在鼠标指针进入 div 元素时发生。 </p> <p>当鼠标指针进入 div 元素及其子元素（p 和 span）时，会发生 onmouseover 事件。</p> <div onmousemove="myMoveFunction()"> <p>onmousemove: <br> <span id="demo">鼠标悬停在我身上！</span></p> </div> <div onmouseenter="myEnterFunction()"> <p>onmouseenter: <br> <span id="demo2">鼠标悬停在我身上！</span></p> </div> <div onmouseover="myOverFunction()"> <p>onmouseover: <br> <span id="demo3">鼠标悬停在我身上！</span></p> </div> <script> var x = 0; var y = 0; var z = 0; function myMoveFunction() { document.getElementById("demo").innerHTML = z+=1; } function myEnterFunction() { document.getElementById("demo2").innerHTML = x+=1; } function myOverFunction() { document.getElementById("demo3").innerHTML = y+=1; } </script> </body> </html>