WheelEvent：deltaZ 属性

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WheelEvent.deltaZ 只读属性是一个表示以 WheelEvent.deltaMode 为单位沿 Z 轴的滚动量的 double 值。

const syntheticEvent = new WheelEvent("syntheticWheel", {
  deltaZ: 4,
  deltaMode: 0,
});

console.log(syntheticEvent.deltaZ);