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https://developer.mozilla.org/zh-CN/docs/Web/API/MouseEvent/clientY
MouseEvent.clientY - Web API | MDN
MouseEvent.clientY 是只读属性，它提供事件发生时的应用客户端区域的垂直坐标 (与页面坐标不同)。例如，当你点击客户端区域的左上角时，鼠标事件的 clientY 值为 0，这一值与页面是否有垂直滚动无关。
web api mdnmouseevent
https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent/y
MouseEvent: y property - Web APIs | MDN
The MouseEvent.y property is an alias for the MouseEvent.clientY property.
property web apismouseevent