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. |
浏览器兼容性
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| Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
| Basic support | 22.0 webkit 37.0 unprefixed |
(Yes) | 1.0 (1.7 or earlier) moz 41 (41) |
未实现 | ? | 未实现 |
| Feature | Android Webview | Edge | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile | Chrome for Android |
|---|---|---|---|---|---|---|---|
| Basic support | 37.0 | (Yes) | 1.0 (1.0) moz 41.0 (41) |
? | ? | ? | (Yes) webkit 37.0 unprefixed |