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js mousemove事件相对位移

mousemove事件中,获取event.movementX,evnet.movementY,

mdn文档上写,是当前screenX减去上次screenX得到的,
image.png
但是打印出来的数据确对不上。

image.png

打印数据,
x:event.screenX,
y:event.screenY,
mx:event.movementX,
my:event.movementY
也试过其他的clientX,pageX
怎么样式精准获取每次事件触发后的鼠标位置,相对绝对的都要。


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