mouseup onmouseup 鼠标按键被松开
The modified onmouseup handler is a composite handler.
修改后的onmouseup处理程序是一个复合的处理程序。
The element's onmousedown handler is invoked, which installs onmousemove and onmouseup handlers.
此元素的 onmousedown 处理程序将被调用，它安装 onmousemove 和 onmouseup 处理程序。
The drag handler for a drag-and-drop operation USES all three mouse handlers: onmousedown, onmouseup, and onmousemove.
针对拖放操作的拖动处理程序使用了这三个鼠标处理程序：onmousedown、onmouseup和onmousemove。
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