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<!DOCTYPE html> <html> <body onwheel="myFunction(event)"> <h1>WheelEvent deltaMode 属性</h1> <p>滚动此页面以查看增量值属性的长度单位。</p> <p><strong>Note:</strong> 0 = pixels, 1 = lines, 2 = pages.</p> <p id="demo"></p> <script> function myFunction(event) { var x = event.deltaMode; document.getElementById("demo").innerHTML = x; } </script> </body> </html>