我用window.event.clientY;去的鼠标位置，但是鼠标滚轮滚动时位置就不准了，很难解决，大家帮帮忙！
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window.event.y用这个
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event.y: Sets or retrieves the y-coordinate, in pixels, of the mouse pointer 's position relative to the parent element.
event.screenY: Sets or retrieves the y-coordinate of the mouse pointer 's position relative to the user 's screen.
event.offsetY: Sets or retrieves the y-coordinate of the mouse pointer 's position relative to the object firing the event.
event.clientY: Sets or retrieves the y-coordinate of the mouse pointer 's position relative to the client area of the window, excluding window decorations and scroll bars.
看看说明，哪个是你需要的。
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window.event.x + document.documentElement.scrollLeft;
window.event.y + document.documentElement.scrollTop;