MouseEvent.movementX 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.movementX = currentEvent.screenX - previousEvent.screenX.
语法
var xShift = instanceOfMouseEvent.movementX
返回值
一个数字
规范
| Specification | Status | Comment |
|---|---|---|
| Pointer Lock MouseEvent.movementX |
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) | 未实现 | ? | 未实现 |