​x
 
<!DOCTYPE html>
<html>
<body onwheel="myFunction(event)">
​
<h1>WheelEvent deltaY 属性</h1>
​
<p>滚动此页面可查看 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>
​