MouseEvent.movementY 是只读属性，它提供了当前事件和上一个 mousemove 事件之间鼠标在水平方向上的移动值。换句话说，这个值是这样计算的 :currentEvent.movementY = currentEvent.screenY - previousEvent.screenY.
语法
var yShift = instanceOfMouseEvent.movementY
返回值
A number
规范
| Specification | Status | Comment |
|---|---|---|
| Pointer Lock MouseEvent.movementY |
Candidate Recommendation | Initial definition. |
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