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<!DOCTYPE html> <html> <body onwheel="myFunction(event)"> <h1>WheelEvent deltaY 属性</h1> <p>滚动此页面以查看 deltaY 属性的值。</p> <p id="demo"></p> <script> function myFunction(event) { var y = event.deltaY; document.getElementById("demo").innerHTML = y; } </script> </body> </html>