WheelEvent.deltaY

WheelEvent.deltaY 只读属性是一个 double 类型值，声明垂直滚动量以WheelEvent.deltaMode 为单位。

语法

var dY = event.deltaY;

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

console.log(syntheticEvent.deltaY);

Specification	Status	Comment
Document Object Model (DOM) Level 3 Events Specification WheelEvent.deltaY	Obsolete	Initial definition.

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